diff --git a/latest version/api/__init__.py b/latest version/api/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/latest version/database/__init__.py b/latest version/database/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/latest version/main.py b/latest version/main.py
index 4690751..d44f28b 100644
--- a/latest version/main.py	
+++ b/latest version/main.py	
@@ -16,8 +16,11 @@ import server.arcdownload
 import server.arcpurchase
 import server.init
 import server.character
+import server.arclinkplay
+from udpserver.udp_main import link_play
 import os
 import sys
+from multiprocessing import Process, Pipe
 
 
 app = Flask(__name__)
@@ -31,62 +34,7 @@ app.register_blueprint(web.login.bp)
 app.register_blueprint(web.index.bp)
 app.register_blueprint(api.api_main.bp)
 
-log_dict = {
-    'version': 1,
-    'root': {
-        'level': 'INFO',
-        'handlers': ['wsgi', 'error_file']
-    },
-    'handlers': {
-        'wsgi': {
-            'class': 'logging.StreamHandler',
-            'stream': 'ext://flask.logging.wsgi_errors_stream',
-            'formatter': 'default'
-        },
-        "error_file": {
-            "class": "logging.handlers.RotatingFileHandler",
-            "maxBytes": 1024 * 1024,
-            "backupCount": 1,
-            "encoding": "utf-8",
-            "level": "ERROR",
-            "formatter": "default",
-            "filename": "./log/error.log"
-        }
-    },
-    'formatters': {
-        'default': {
-            'format': '[%(asctime)s] %(levelname)s in %(module)s: %(message)s'
-        }
-    }
-}
-if Config.ALLOW_LOG_INFO:
-    log_dict['root']['handlers'] = ['wsgi', 'info_file', 'error_file']
-    log_dict['handlers']['info_file'] = {
-        "class": "logging.handlers.RotatingFileHandler",
-        "maxBytes": 1024 * 1024,
-        "backupCount": 1,
-        "encoding": "utf-8",
-        "level": "INFO",
-        "formatter": "default",
-        "filename": "./log/info.log"
-    }
-
-dictConfig(log_dict)
-
-if not server.init.check_before_run(app):
-    app.logger.error('Something wrong. The server will not run.')
-    input('Press ENTER key to exit.')
-    sys.exit()
-
-app.logger.info("Start to initialize data in 'songfile' table...")
-try:
-    error = server.arcdownload.initialize_songfile()
-except:
-    error = 'Something wrong.'
-if error:
-    app.logger.warning(error)
-else:
-    app.logger.info('Complete!')
+conn1, conn2 = Pipe()
 
 
 def add_url_prefix(url, strange_flag=False):
@@ -702,40 +650,70 @@ def download(file_path):
 @app.route(add_url_prefix('/multiplayer/me/room/create'), methods=['POST'])
 @server.auth.auth_required(request)
 def room_create(user_id):
-    return error_return(151)
-    # return jsonify({
-    #     "success": True,
-    #     "value": {
-    #         "roomCode": "Fuck616",
-    #         "roomId": "16465282253677196096",
-    #         "token": "16465282253677196096",
-    #         "key": "czZNUmivWm6c3SpMaPIXcA==",
-    #         "playerId": "12753",
-    #         "userId": user_id,
-    #         "endPoint": "192.168.1.200",
-    #         "port": 10900,
-    #         "orderedAllowedSongs": "9w93DwcH93AA8HcPAAAHAHcAAHBwAABwcAAAAHB3AAAAcAcAAHAAAHAAAAB3BwD3AAAABwAAAAAAAAAAAAAAAAAAAAAAAAAHAHAHBwcAAAAAcHd3cAAAAAAHBwcAAAAAAAAAAAAHdwAHAAAAcAdwBwAAAAAAdwcAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA="
-    #     }
-    # })
+    if not Config.UDP_PORT or Config.UDP_PORT == '':
+        return error_return(151), 404
+
+    client_song_map = request.json['clientSongMap']
+    error_code, value = server.arclinkplay.create_room(
+        conn1, user_id, client_song_map)
+
+    if error_code == 0:
+        value['endPoint'] = request.host.split(':')[0]
+        value['port'] = int(Config.UDP_PORT)
+        return jsonify({
+            "success": True,
+            "value": value
+        })
+    else:
+        return error_return(error_code), 400
 
 
 # 加入房间
 @app.route(add_url_prefix('/multiplayer/me/room/join/<room_code>'), methods=['POST'])
 @server.auth.auth_required(request)
 def room_join(user_id, room_code):
-    return error_return(151)
+    if not Config.UDP_PORT or Config.UDP_PORT == '':
+        return error_return(151), 404
+
+    client_song_map = request.json['clientSongMap']
+    error_code, value = server.arclinkplay.join_room(
+        conn1, user_id, client_song_map, room_code)
+
+    if error_code == 0:
+        value['endPoint'] = request.host.split(':')[0]
+        value['port'] = int(Config.UDP_PORT)
+        return jsonify({
+            "success": True,
+            "value": value
+        })
+    else:
+        return error_return(error_code), 400
 
 
-@app.route(add_url_prefix('/multiplayer/me/update'), methods=['POST'])  # ？
+@app.route(add_url_prefix('/multiplayer/me/update'), methods=['POST'])  # 更新房间
 @server.auth.auth_required(request)
 def multiplayer_update(user_id):
-    return error_return(151)
+    if not Config.UDP_PORT or Config.UDP_PORT == '':
+        return error_return(151), 404
+
+    token = request.json['token']
+    error_code, value = server.arclinkplay.update_room(conn1, user_id, token)
+
+    if error_code == 0:
+        value['endPoint'] = request.host.split(':')[0]
+        value['port'] = int(Config.UDP_PORT)
+        return jsonify({
+            "success": True,
+            "value": value
+        })
+    else:
+        return error_return(error_code), 400
 
 
 @app.route(add_url_prefix('/user/me/request_delete'), methods=['POST'])  # 删除账号
 @server.auth.auth_required(request)
 def user_delete(user_id):
-    return error_return(151)
+    return error_return(151), 404
 
 
 # 三个设置，写在最后降低优先级
@@ -751,11 +729,80 @@ def sys_set(user_id, path):
 
 
 def main():
-    if Config.SSL_CERT and Config.SSL_KEY:
-        app.run(Config.HOST, Config.PORT, ssl_context=(
-            Config.SSL_CERT, Config.SSL_KEY))
+    log_dict = {
+        'version': 1,
+        'root': {
+            'level': 'INFO',
+            'handlers': ['wsgi', 'error_file']
+        },
+        'handlers': {
+            'wsgi': {
+                'class': 'logging.StreamHandler',
+                'stream': 'ext://flask.logging.wsgi_errors_stream',
+                'formatter': 'default'
+            },
+            "error_file": {
+                "class": "logging.handlers.RotatingFileHandler",
+                "maxBytes": 1024 * 1024,
+                "backupCount": 1,
+                "encoding": "utf-8",
+                "level": "ERROR",
+                "formatter": "default",
+                "filename": "./log/error.log"
+            }
+        },
+        'formatters': {
+            'default': {
+                'format': '[%(asctime)s] %(levelname)s in %(module)s: %(message)s'
+            }
+        }
+    }
+    if Config.ALLOW_LOG_INFO:
+        log_dict['root']['handlers'] = ['wsgi', 'info_file', 'error_file']
+        log_dict['handlers']['info_file'] = {
+            "class": "logging.handlers.RotatingFileHandler",
+            "maxBytes": 1024 * 1024,
+            "backupCount": 1,
+            "encoding": "utf-8",
+            "level": "INFO",
+            "formatter": "default",
+            "filename": "./log/info.log"
+        }
+
+    dictConfig(log_dict)
+
+    if not server.init.check_before_run(app):
+        app.logger.error('Something wrong. The server will not run.')
+        input('Press ENTER key to exit.')
+        sys.exit()
+
+    app.logger.info("Start to initialize data in 'songfile' table...")
+    try:
+        error = server.arcdownload.initialize_songfile()
+    except:
+        error = 'Something wrong.'
+    if error:
+        app.logger.warning(error)
     else:
-        app.run(Config.HOST, Config.PORT)
+        app.logger.info('Complete!')
+
+    if Config.UDP_PORT and Config.UDP_PORT != '':
+        process = [Process(target=link_play, args=(
+            conn2, Config.HOST, int(Config.UDP_PORT)))]
+        [p.start() for p in process]
+        app.logger.info("UDP server is running...")
+        if Config.SSL_CERT and Config.SSL_KEY:
+            app.run(Config.HOST, Config.PORT, ssl_context=(
+                Config.SSL_CERT, Config.SSL_KEY))
+        else:
+            app.run(Config.HOST, Config.PORT)
+        [p.join() for p in process]
+    else:
+        if Config.SSL_CERT and Config.SSL_KEY:
+            app.run(Config.HOST, Config.PORT, ssl_context=(
+                Config.SSL_CERT, Config.SSL_KEY))
+        else:
+            app.run(Config.HOST, Config.PORT)
 
 
 if __name__ == '__main__':
diff --git a/latest version/server/__init__.py b/latest version/server/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/latest version/server/arclinkplay.py b/latest version/server/arclinkplay.py
new file mode 100644
index 0000000..4fe5bf7
--- /dev/null
+++ b/latest version/server/arclinkplay.py	
@@ -0,0 +1,113 @@
+from .sql import Connect
+import base64
+
+
+def get_song_unlock(client_song_map):
+    # 处理可用歌曲bit，返回bytes
+
+    user_song_unlock = [0] * 512
+    for i in range(0, 1024, 2):
+        x = 0
+        y = 0
+        if str(i) in client_song_map:
+            if client_song_map[str(i)][0]:
+                x += 1
+            if client_song_map[str(i)][1]:
+                x += 2
+            if client_song_map[str(i)][2]:
+                x += 4
+            if client_song_map[str(i)][3]:
+                x += 8
+        if str(i+1) in client_song_map:
+            if client_song_map[str(i+1)][0]:
+                y += 1
+            if client_song_map[str(i+1)][1]:
+                y += 2
+            if client_song_map[str(i+1)][2]:
+                y += 4
+            if client_song_map[str(i+1)][3]:
+                y += 8
+
+        user_song_unlock[i // 2] = y*16 + x
+
+    return bytes(user_song_unlock)
+
+
+def create_room(conn, user_id, client_song_map):
+    # 创建房间，返回错误码和房间与用户信息
+    error_code = 108
+
+    with Connect() as c:
+        c.execute('''select name from user where user_id=?''', (user_id,))
+        x = c.fetchone()
+        if x is not None:
+            name = x[0]
+
+    song_unlock = get_song_unlock(client_song_map)
+
+    conn.send((1, name, song_unlock))
+    data = conn.recv()
+    if data[0] == 0:
+        error_code = 0
+        return error_code, {'roomCode': data[1],
+                            'roomId': str(data[2]),
+                            'token': str(data[3]),
+                            'key': (base64.b64encode(data[4])).decode(),
+                            'playerId': str(data[5]),
+                            'userId': user_id,
+                            'orderedAllowedSongs': (base64.b64encode(song_unlock)).decode()
+                            }
+
+    return error_code, None
+
+
+def join_room(conn, user_id, client_song_map, room_code):
+    # 加入房间，返回错误码和房间与用户信息
+    error_code = 108
+
+    with Connect() as c:
+        c.execute('''select name from user where user_id=?''', (user_id,))
+        x = c.fetchone()
+        if x is not None:
+            name = x[0]
+
+    song_unlock = get_song_unlock(client_song_map)
+
+    conn.send((2, name, song_unlock, room_code))
+    data = conn.recv()
+    if data[0] == 0:
+        error_code = 0
+        return error_code, {'roomCode': data[1],
+                            'roomId': str(data[2]),
+                            'token': str(data[3]),
+                            'key': (base64.b64encode(data[4])).decode(),
+                            'playerId': str(data[5]),
+                            'userId': user_id,
+                            'orderedAllowedSongs': (base64.b64encode(data[6])).decode()
+                            }
+    else:
+        error_code = data[0]
+
+    return error_code, None
+
+
+def update_room(conn, user_id, token):
+    # 更新房间，返回错误码和房间与用户信息
+    error_code = 108
+
+    conn.send((3, int(token)))
+    data = conn.recv()
+    if data[0] == 0:
+        error_code = 0
+        return error_code, {'roomCode': data[1],
+                            'roomId': str(data[2]),
+                            'token': token,
+                            'key': (base64.b64encode(data[3])).decode(),
+                            'playerId': str(data[4]),
+                            'userId': user_id,
+                            'orderedAllowedSongs': (base64.b64encode(data[5])).decode()
+                            }
+    else:
+        error_code = data[0]
+
+    return error_code, None
diff --git a/latest version/setting.py b/latest version/setting.py
index 0184c7e..6ff0175 100644
--- a/latest version/setting.py	
+++ b/latest version/setting.py	
@@ -35,6 +35,17 @@ class Config():
     --------------------
     '''
 
+    '''
+    --------------------
+    联机功能的端口号，若为空，则默认不开启联机功能
+    Port of your link play server
+    If it is blank, link play will be unavailable.
+    '''
+    UDP_PORT = '10900'
+    '''
+    --------------------
+    '''
+
     '''
     --------------------
     SSL证书路径
diff --git a/latest version/udpserver/__init__.py b/latest version/udpserver/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/latest version/udpserver/aes.py b/latest version/udpserver/aes.py
new file mode 100644
index 0000000..21de449
--- /dev/null
+++ b/latest version/udpserver/aes.py	
@@ -0,0 +1,24 @@
+import os
+from cryptography.hazmat.primitives.ciphers import (
+    Cipher, algorithms, modes
+)
+
+
+def encrypt(key, plaintext, associated_data):
+    iv = os.urandom(12)
+    encryptor = Cipher(
+        algorithms.AES(key),
+        modes.GCM(iv, min_tag_length=12),
+    ).encryptor()
+    encryptor.authenticate_additional_data(associated_data)
+    ciphertext = encryptor.update(plaintext) + encryptor.finalize()
+    return (iv, ciphertext, encryptor.tag)
+
+
+def decrypt(key, associated_data, iv, ciphertext, tag):
+    decryptor = Cipher(
+        algorithms.AES(key),
+        modes.GCM(iv, tag, min_tag_length=12),
+    ).decryptor()
+    decryptor.authenticate_additional_data(associated_data)
+    return decryptor.update(ciphertext) + decryptor.finalize()
diff --git a/latest version/udpserver/udp_class.py b/latest version/udpserver/udp_class.py
new file mode 100644
index 0000000..c79ea1d
--- /dev/null
+++ b/latest version/udpserver/udp_class.py	
@@ -0,0 +1,174 @@
+def b(value, length=1):
+    return value.to_bytes(length=length, byteorder='little')
+
+
+def bi(value):
+    return int.from_bytes(value, byteorder='little')
+
+
+class Player:
+    def __init__(self) -> None:
+        self.player_id = 0
+        self.player_name = b'\x45\x6d\x70\x74\x79\x50\x6c\x61\x79\x65\x72\x00\x00\x00\x00\x00'
+        self.token = 0
+
+        self.character_id = 0xff
+        self.last_character_id = 0xff
+        self.is_uncapped = 0
+
+        self.difficulty = 0xff
+        self.last_difficulty = 0xff
+        self.score = 0
+        self.last_score = 0
+        self.timer = 0
+        self.last_timer = 0
+        self.cleartype = 0
+        self.last_cleartype = 0
+        self.best_score_flag = 0
+        self.best_player_flag = 0
+        self.finish_flag = 0
+
+        self.player_state = 1
+        self.download_percent = 0
+        self.online = 0
+
+        self.last_timestamp = 0
+        self.extra_command_queue = []
+
+        self.song_unlock = b'\x00' * 512
+
+        self.start_command_num = 0
+
+    def set_player_name(self, player_name: str):
+        self.player_name = player_name.encode('ascii')
+        if len(self.player_name) > 16:
+            self.player_name = self.player_name[:16]
+        else:
+            self.player_name += b'\x00' * (16 - len(self.player_name))
+
+
+class Room:
+    def __init__(self) -> None:
+        self.room_id = 0
+        self.room_code = 'AAAA00'
+
+        self.countdown = 0xffffffff
+        self.timestamp = 0
+        self.state = 0
+        self.song_idx = 0xffff
+        self.last_song_idx = 0xffff
+
+        self.song_unlock = b'\x00' * 512
+
+        self.host_id = 0
+        self.players = [Player(), Player(), Player(), Player()]
+        self.player_num = 0
+
+        self.interval = 1000
+        self.times = 100
+
+        self.round_switch = 0
+
+        self.command_queue = []
+        self.command_queue_length = 0
+
+    def get_players_info(self):
+        # 获取所有玩家信息
+        re = b''
+        for i in self.players:
+            re += b(i.player_id, 8) + b(i.character_id) + b(i.is_uncapped) + b(i.difficulty) + b(i.score, 4) + \
+                b(i.timer, 4) + b(i.cleartype) + b(i.player_state) + \
+                b(i.download_percent) + b(i.online) + b'\x00' + i.player_name
+        return re
+
+    def get_player_last_score(self):
+        # 获取上次曲目玩家分数，返回bytes
+        if self.last_song_idx == 0xffff:
+            return b'\xff\xff\x00\x00\x00\x00\x00\x00\x00' * 4
+        re = b''
+
+        for i in range(4):
+            player = self.players[i]
+
+            if player.player_id != 0:
+                re += b(player.last_character_id) + b(player.last_difficulty) + b(player.last_score, 4) + b(
+                    player.last_cleartype) + b(player.best_score_flag) + b(player.best_player_flag)
+            else:
+                re += b'\xff\xff\x00\x00\x00\x00\x00\x00\x00'
+
+        return re
+
+    def make_round(self):
+        # 轮换房主
+        for i in range(4):
+            if self.players[i].player_id == self.host_id:
+                for j in range(1, 4):
+                    if self.players[(i + j) % 4].player_id != 0:
+                        self.host_id = self.players[(i + j) % 4].player_id
+                        break
+                break
+
+    def delete_player(self, player_index: int):
+        # 删除某个玩家
+        self.player_num -= 1
+        if self.players[player_index].player_id == self.host_id:
+            self.make_round()
+
+        self.players[player_index].online = 0
+        self.players[player_index] = Player()
+        self.update_song_unlock()
+
+    def update_song_unlock(self):
+        # 更新房间可用歌曲
+        r = bi(b'\xff' * 512)
+        for i in self.players:
+            if i.player_id != 0:
+                r &= bi(i.song_unlock)
+
+        self.song_unlock = b(r, 512)
+
+    def is_ready(self, old_state: int, player_state: int):
+        # 是否全部准备就绪
+        if self.state == old_state:
+            for i in self.players:
+                if i.player_id != 0 and (i.player_state != player_state or i.online == 0):
+                    return False
+
+            return True
+        else:
+            return False
+
+    def is_finish(self):
+        # 是否全部进入结算
+        for i in self.players:
+            if i.player_id != 0 and (i.finish_flag == 0 or i.online == 0):
+                return False
+
+        return True
+
+    def make_finish(self):
+        # 结算
+        self.state = 8
+        self.last_song_idx = self.song_idx
+
+        max_score = 0
+        max_score_i = []
+        for i in range(4):
+            player = self.players[i]
+            if player.player_id != 0:
+                player.finish_flag = 0
+                player.last_timer = player.timer
+                player.last_score = player.score
+                player.last_cleartype = player.cleartype
+                player.last_character_id = player.character_id
+                player.last_difficulty = player.difficulty
+                player.best_player_flag = 0
+
+                if player.last_score > max_score:
+                    max_score = player.last_score
+                    max_score_i = [i]
+                elif player.last_score == max_score:
+                    max_score_i.append(i)
+
+        for i in max_score_i:
+            self.players[i].best_player_flag = 1
diff --git a/latest version/udpserver/udp_config.py b/latest version/udpserver/udp_config.py
new file mode 100644
index 0000000..0a0a9d6
--- /dev/null
+++ b/latest version/udpserver/udp_config.py	
@@ -0,0 +1,8 @@
+class Config:
+    TIME_LIMIT = 3600000
+
+    COMMAND_INTERVAL = 1000000
+
+    COUNTDOWM_TIME = 3999
+
+    PLAYER_TIMEOUT = 30000000
diff --git a/latest version/udpserver/udp_main.py b/latest version/udpserver/udp_main.py
new file mode 100644
index 0000000..cd0cc80
--- /dev/null
+++ b/latest version/udpserver/udp_main.py	
@@ -0,0 +1,223 @@
+import socketserver
+import threading
+import os
+import random
+import time
+# import binascii
+from . import aes
+from .udp_parser import CommandParser
+from .udp_class import Room, Player, bi
+from .udp_config import Config
+
+
+# token: {'key': key, 'room': Room, 'player_index': player_index, 'player_id': player_id}
+link_play_data = {}
+room_id_dict = {}  # 'room_id': Room
+room_code_dict = {}  # 'room_code': Room
+player_dict = {}  # 'player_id' : Player
+clean_timer = 0
+
+
+def random_room_code():
+    # 随机生成房间号
+    re = ''
+    for _ in range(4):
+        re += chr(random.randint(65, 90))
+    for _ in range(2):
+        re += str(random.randint(0, 9))
+
+    return re
+
+
+def clear_player(token):
+    # 清除玩家信息和token
+    del player_dict[link_play_data[token]['player_id']]
+    del link_play_data[token]
+
+
+def clear_room(room):
+    # 清除房间信息
+    room_id = room.room_id
+    room_code = room.room_code
+    del room_id_dict[room_id]
+    del room_code_dict[room_code]
+    del room
+
+
+def memory_clean(now):
+    # 内存清理
+    clean_room_list = []
+    clean_player_list = []
+    for token in link_play_data:
+        room = link_play_data[token]['room']
+        if now - room.timestamp >= Config.TIME_LIMIT:
+            clean_room_list.append(room.room_id)
+
+        if now - room.players[link_play_data[token]['player_index']].last_timestamp // 1000 >= Config.TIME_LIMIT:
+            clean_player_list.append(token)
+
+    for room_id in room_id_dict:
+        if now - room_id_dict[room_id].timestamp >= Config.TIME_LIMIT:
+            clean_room_list.append(room_id)
+
+    for room_id in clean_room_list:
+        if room_id in room_id_dict:
+            clear_room(room_id_dict[room_id])
+
+    for token in clean_player_list:
+        clear_player(token)
+
+
+class UDPhandler(socketserver.BaseRequestHandler):
+    def handle(self):
+        client_msg, server = self.request
+        token = client_msg[:8]
+        iv = client_msg[8:20]
+        tag = client_msg[20:32]
+        ciphertext = client_msg[32:]
+        if int.from_bytes(token, byteorder='little') in link_play_data:
+            user = link_play_data[bi(token)]
+        else:
+            return None
+
+        plaintext = aes.decrypt(user['key'], b'', iv, ciphertext, tag)
+        # print(binascii.b2a_hex(plaintext))
+
+        commands = CommandParser(
+            user['room'], user['player_index']).get_commands(plaintext)
+
+        if user['room'].players[user['player_index']].player_id == 0:
+            clear_player(bi(token))
+            temp = []
+            for i in commands:
+                if i[:3] == b'\x06\x16\x12':
+                    temp.append(i)
+            commands = temp
+            # 处理不能正确被踢的问题
+
+        for i in commands:
+            iv, ciphertext, tag = aes.encrypt(user['key'], i, b'')
+            # print(binascii.b2a_hex(i))
+
+            server.sendto(token + iv + tag[:12] +
+                          ciphertext, self.client_address)
+
+
+def server_run(ip, port):
+    server = socketserver.ThreadingUDPServer((ip, port), UDPhandler)
+    server.serve_forever()
+
+
+def data_swap(conn):
+    clean_timer = 0
+    while True:
+        try:
+            data = conn.recv()
+        except EOFError:
+            break
+
+        now = round(time.time() * 1000)
+        if now - clean_timer >= Config.TIME_LIMIT:
+            clean_timer = now
+            memory_clean(now)
+
+        if data[0] == 1:
+            # 开房
+            key = os.urandom(16)
+            room_id = bi(os.urandom(8))
+            while room_id in room_id_dict and room_id == 0:
+                room_id = bi(os.urandom(8))
+            room = Room()
+            room.room_id = room_id
+            room_id_dict[room_id] = room
+
+            player_id = bi(os.urandom(3))
+            while player_id in player_dict and player_id == 0:
+                player_id = bi(os.urandom(3))
+            player = Player()
+            player.player_id = player_id
+            player.set_player_name(data[1])
+            player_dict[player_id] = player
+
+            player.song_unlock = data[2]
+            room.song_unlock = data[2]
+            room.host_id = player_id
+            room.players[0] = player
+            room.player_num = 1
+
+            room_code = random_room_code()
+            while room_code in room_code_dict:
+                room_code = random_room_code()
+            room.room_code = room_code
+            room_code_dict[room_code] = room
+
+            token = room_id
+            player.token = token
+
+            link_play_data[token] = {'key': key,
+                                     'room': room,
+                                     'player_index': 0,
+                                     'player_id': player_id}
+
+            conn.send((0, room_code, room_id, token, key, player_id))
+
+        elif data[0] == 2:
+            room_code = data[3].upper()
+            if room_code not in room_code_dict:
+                # 房间号错误
+                conn.send((1202, ))
+            else:
+                room = room_code_dict[room_code]
+                if room.player_num == 4:
+                    # 满人
+                    conn.send((1201, ))
+                elif room.state != 2:
+                    # 无法加入
+                    conn.send((1205, ))
+                else:
+                    key = os.urandom(16)
+                    token = bi(os.urandom(8))
+
+                    player_id = bi(os.urandom(3))
+                    while player_id in player_dict and player_id == 0:
+                        player_id = bi(os.urandom(3))
+                    player = Player()
+                    player.player_id = player_id
+                    player.set_player_name(data[1])
+                    player.token = token
+                    player_dict[player_id] = player
+
+                    player.song_unlock = data[2]
+
+                    room.update_song_unlock()
+                    for i in range(4):
+                        if room.players[i].player_id == 0:
+                            room.players[i] = player
+                            player_index = i
+                            break
+
+                    link_play_data[token] = {'key': key,
+                                             'room': room,
+                                             'player_index': player_index,
+                                             'player_id': player_id}
+
+                    conn.send((0, room_code, room.room_id,
+                               token, key, player_id, room.song_unlock))
+        elif data[0] == 3:
+            token = data[1]
+            if token in link_play_data:
+                r = link_play_data[token]
+                conn.send((0, r['room'].room_code, r['room'].room_id, r['key'],
+                           r['room'].players[r['player_index']].player_id, r['room'].song_unlock))
+            else:
+                conn.send((108, ))
+
+
+def link_play(conn, ip: str, port: int):
+    try:
+        server = threading.Thread(target=server_run, args=(ip, port))
+        data_exchange = threading.Thread(target=data_swap, args=(conn,))
+        server.start()
+        data_exchange.start()
+    except:
+        pass
diff --git a/latest version/udpserver/udp_parser.py b/latest version/udpserver/udp_parser.py
new file mode 100644
index 0000000..7c74afc
--- /dev/null
+++ b/latest version/udpserver/udp_parser.py	
@@ -0,0 +1,333 @@
+from operator import irshift
+from .udp_sender import CommandSender
+from .udp_class import bi, Room
+from .udp_config import Config
+import time
+
+
+class CommandParser:
+    def __init__(self, room: Room, player_index: int = 0) -> None:
+        self.room = room
+        self.player_index = player_index
+
+    def get_commands(self, command):
+        self.command = command
+        l = {b'\x06\x16\x01': self.command_01,
+             b'\x06\x16\x02': self.command_02,
+             b'\x06\x16\x03': self.command_03,
+             b'\x06\x16\x04': self.command_04,
+             b'\x06\x16\x05': self.command_05,
+             b'\x06\x16\x06': self.command_06,
+             b'\x06\x16\x07': self.command_07,
+             b'\x06\x16\x08': self.command_08,
+             b'\x06\x16\x09': self.command_09,
+             b'\x06\x16\x0a': self.command_0a,
+             b'\x06\x16\x0b': self.command_0b
+             }
+        r = l[command[:3]]()
+
+        re = []
+
+        flag_13 = False
+        for i in range(max(bi(self.command[12:16]), self.room.players[self.player_index].start_command_num), self.room.command_queue_length):
+            if self.room.command_queue[i][:3] == b'\x06\x16\x13':
+                if flag_13:
+                    break
+                flag_13 = True
+            re.append(self.room.command_queue[i])
+
+        if self.room.players[self.player_index].extra_command_queue:
+            re += self.room.players[self.player_index].extra_command_queue
+            self.room.players[self.player_index].extra_command_queue = []
+
+        if r:
+            re += r
+
+        return re
+
+    def command_01(self):
+        # 给房主
+        player_id = bi(self.command[24:32])
+        for i in self.room.players:
+            if i.player_id == player_id and i.online == 1:
+                self.room.host_id = player_id
+
+        x = CommandSender(self.room)
+        x.random_code = self.command[16:24]
+        self.room.command_queue_length += 1
+        self.room.command_queue.append(x.command_10())
+
+        return None
+
+    def command_02(self):
+        x = CommandSender(self.room)
+        x.random_code = self.command[16:24]
+        song_idx = bi(self.command[24:26])
+
+        flag = 2
+        if self.room.state == 2:
+            flag = 0
+            self.room.state = 3
+            self.room.song_idx = song_idx
+            self.room.command_queue_length += 1
+            self.room.command_queue.append(x.command_11())
+            self.room.command_queue_length += 1
+            self.room.command_queue.append(x.command_13())
+
+        return [x.command_0d(flag)]
+
+    def command_03(self):
+        # 尝试进入结算
+        x = CommandSender(self.room)
+        x.random_code = self.command[16:24]
+        player = self.room.players[self.player_index]
+        player.score = bi(self.command[24:28])
+        player.cleartype = self.command[28]
+        player.difficulty = self.command[29]
+        player.best_score_flag = self.command[30]
+        player.finish_flag = 1
+        player.last_timestamp -= Config.COMMAND_INTERVAL
+        self.room.last_song_idx = self.room.song_idx
+
+        self.room.command_queue_length += 1
+        self.room.command_queue.append(x.command_12(self.player_index))
+
+        if self.room.is_finish():
+            self.room.make_finish()
+            self.room.command_queue_length += 1
+            self.room.command_queue.append(x.command_13())
+
+        return None
+
+    def command_04(self):
+        # 踢人
+        x = CommandSender(self.room)
+        x.random_code = self.command[16:24]
+        player_id = bi(self.command[24:32])
+        flag = 2
+        if self.room.players[self.player_index].player_id == self.room.host_id and player_id != self.room.host_id:
+            for i in range(4):
+                if self.room.players[i].player_id == player_id:
+                    flag = 1
+                    self.room.delete_player(i)
+                    self.room.command_queue_length += 1
+                    self.room.command_queue.append(x.command_12(i))
+                    self.room.update_song_unlock()
+                    self.room.command_queue_length += 1
+                    self.room.command_queue.append(x.command_14())
+                    break
+
+        return [x.command_0d(flag)]
+
+    def command_05(self):
+        pass
+
+    def command_06(self):
+        x = CommandSender(self.room)
+        x.random_code = self.command[16:24]
+        self.room.state = 1
+        self.room.song_idx = 0xffff
+
+        self.room.command_queue_length += 1
+        self.room.command_queue.append(x.command_13())
+        return None
+
+    def command_07(self):
+        x = CommandSender(self.room)
+        x.random_code = self.command[16:24]
+        self.room.players[self.player_index].song_unlock = self.command[24:536]
+        self.room.update_song_unlock()
+
+        self.room.command_queue_length += 1
+        self.room.command_queue.append(x.command_14())
+        return None
+
+    def command_08(self):
+        self.room.round_switch = bi(self.command[24:25])
+        x = CommandSender(self.room)
+        x.random_code = self.command[16:24]
+        self.room.command_queue_length += 1
+        self.room.command_queue.append(x.command_13())
+
+        return None
+
+    def command_09(self):
+        re = []
+        x = CommandSender(self.room)
+        x.random_code = self.command[16:24]
+        player = self.room.players[self.player_index]
+
+        if bi(self.command[12:16]) == 0:
+            player.online = 1
+            self.room.state = 1
+            self.room.update_song_unlock()
+            player.start_command_num = self.room.command_queue_length
+            self.room.command_queue_length += 1
+            self.room.command_queue.append(x.command_15())
+        else:
+            if x.timestamp - player.last_timestamp >= Config.COMMAND_INTERVAL:
+                re.append(x.command_0c())
+                player.last_timestamp = x.timestamp
+
+            # 离线判断
+            for i in range(4):
+                if i != self.player_index:
+                    t = self.room.players[i]
+                    if t.player_id != 0:
+                        if t.last_timestamp != 0:
+                            if t.online == 1 and x.timestamp - t.last_timestamp >= 5000000:
+                                t.online = 0
+                                self.room.command_queue_length += 1
+                                self.room.command_queue.append(x.command_12(i))
+                            elif t.online == 0 and x.timestamp - t.last_timestamp >= Config.PLAYER_TIMEOUT:
+                                self.room.delete_player(i)
+                                self.room.command_queue_length += 1
+                                self.room.command_queue.append(x.command_12(i))
+
+            flag_11 = False
+            flag_12 = False
+            flag_13 = False
+
+            if player.online == 0:
+                flag_12 = True
+                player.online = 1
+
+            if self.room.is_ready(1, 1):
+                flag_13 = True
+                self.room.state = 2
+
+            if player.player_state != self.command[32]:
+                flag_12 = True
+                player.player_state = self.command[32]
+
+            if player.difficulty != self.command[33] and player.player_state != 5 and player.player_state != 6 and player.player_state != 7 and player.player_state != 8:
+                flag_12 = True
+                player.difficulty = self.command[33]
+
+            if player.cleartype != self.command[34] and player.player_state != 7 and player.player_state != 8:
+                flag_12 = True
+                player.cleartype = self.command[34]
+
+            if player.download_percent != self.command[35]:
+                flag_12 = True
+                player.download_percent = self.command[35]
+
+            if player.character_id != self.command[36]:
+                flag_12 = True
+                player.character_id = self.command[36]
+
+            if player.is_uncapped != self.command[37]:
+                flag_12 = True
+                player.is_uncapped = self.command[37]
+
+            if self.room.state == 3 and player.score != bi(self.command[24:28]):
+                flag_12 = True
+                player.score = bi(self.command[24:28])
+
+            if self.room.is_ready(3, 4):
+                flag_13 = True
+                self.room.countdown = Config.COUNTDOWM_TIME
+                self.room.timestamp = round(time.time() * 1000)
+                self.room.state = 4
+
+            if self.room.state == 4 or self.room.state == 5 or self.room.state == 6:
+                timestamp = round(time.time() * 1000)
+                self.room.countdown -= timestamp - self.room.timestamp
+                self.room.timestamp = timestamp
+                if self.room.state == 4 and self.room.countdown <= 0:
+                    # 此处不清楚
+                    self.room.state = 5
+                    self.room.countdown = 5999
+                    flag_11 = True
+                    flag_13 = True
+
+                if self.room.state == 5 and self.room.is_ready(5, 6):
+                    self.room.state = 6
+                    flag_13 = True
+
+                if self.room.state == 5 and self.room.is_ready(5, 7):
+                    self.room.state = 7
+                    self.room.countdown = 0xffffffff
+                    flag_13 = True
+
+                if self.room.state == 5 and self.room.countdown <= 0:
+                    print('我怎么知道这是啥')
+
+                if self.room.state == 6 and self.room.countdown <= 0:
+                    # 此处不清楚
+                    self.room.state = 7
+                    self.room.countdown = 0xffffffff
+                    flag_13 = True
+
+                if self.room.countdown <= 0:
+                    self.room.countdown = 0
+
+            if self.room.state == 7 or self.room.state == 8:
+                if player.timer < bi(self.command[28:32]) or bi(self.command[28:32]) == 0 and player.timer != 0:
+                    player.last_timer = player.timer
+                    player.last_score = player.score
+                    player.timer = bi(self.command[28:32])
+                    player.score = bi(self.command[24:28])
+
+                if player.timer != 0 or self.room.state != 8:
+                    for i in self.room.players:
+                        i.extra_command_queue.append(
+                            x.command_0e(self.player_index))
+
+                if self.room.is_ready(8, 1):
+                    flag_13 = True
+                    self.room.state = 1
+                    self.room.song_idx = 0xffff
+                    if self.room.round_switch == 1:
+                        self.room.make_round()
+
+                    for i in self.room.players:
+                        i.timer = 0
+                        i.score = 0
+
+                if self.room.is_finish():
+                    # 有人退房导致的结算
+                    self.room.make_finish()
+                    flag_13 = True
+
+            if flag_11:
+                self.room.command_queue_length += 1
+                self.room.command_queue.append(x.command_11())
+            if flag_12:
+                self.room.command_queue_length += 1
+                self.room.command_queue.append(x.command_12(self.player_index))
+            if flag_13:
+                self.room.command_queue_length += 1
+                self.room.command_queue.append(x.command_13())
+
+        return re
+
+    def command_0a(self):
+        # 退出房间
+        self.room.delete_player(self.player_index)
+
+        x = CommandSender(self.room)
+        self.room.command_queue_length += 1
+        self.room.command_queue.append(x.command_12(self.player_index))
+
+        if self.room.state == 3:
+            self.room.state = 1
+            self.room.song_idx = 0xffff
+        # self.room.command_queue_length += 1
+        # self.room.command_queue.append(x.command_11())
+        self.room.command_queue_length += 1
+        self.room.command_queue.append(x.command_13())
+        self.room.command_queue_length += 1
+        self.room.command_queue.append(x.command_14())
+        return None
+
+    def command_0b(self):
+        # 推荐歌曲
+        song_idx = bi(self.command[16:18])
+        x = CommandSender(self.room)
+        for i in range(4):
+            if self.player_index != i and self.room.players[i].online == 1:
+                self.room.players[i].extra_command_queue.append(
+                    x.command_0f(self.player_index, song_idx))
+
+        return None
diff --git a/latest version/udpserver/udp_sender.py b/latest version/udpserver/udp_sender.py
new file mode 100644
index 0000000..3d2d9f8
--- /dev/null
+++ b/latest version/udpserver/udp_sender.py	
@@ -0,0 +1,46 @@
+import time
+from .udp_class import Room, b
+
+
+class CommandSender:
+    def __init__(self, room: Room = Room()) -> None:
+        self.room = room
+        self.timestamp = round(time.time() * 1000000)
+
+        self.random_code = b'\x11\x11\x11\x11\x00\x00\x00\x00'
+
+    def command_0c(self):
+        return b'\x06\x16\x0c\x09' + b(self.room.room_id, 8) + b(self.room.command_queue_length, 4) + self.random_code + b(self.room.state) + b(self.room.countdown, 4) + b(self.timestamp, 8) + b'\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b'
+
+    def command_0d(self, code: int):
+        return b'\x06\x16\x0d\x09' + b(self.room.room_id, 8) + b(self.room.command_queue_length, 4) + self.random_code + b(code) + b'\x07\x07\x07\x07\x07\x07\x07'
+
+    def command_0e(self, player_index: int):
+        # 分数广播
+        player = self.room.players[player_index]
+        return b'\x06\x16\x0e\x09' + b(self.room.room_id, 8) + b(self.room.command_queue_length, 4) + b(player.player_id, 8) + b(player.character_id) + b(player.is_uncapped) + b(player.difficulty) + b(player.score, 4) + b(player.timer, 4) + b(player.cleartype) + b(player.player_state) + b(player.download_percent) + b'\x01' + b(player.last_score, 4) + b(player.last_timer, 4) + b(player.online)
+
+    def command_0f(self, player_index: int, song_idx: int):
+        # 歌曲推荐
+        player = self.room.players[player_index]
+        return b'\x06\x16\x0f\x09' + b(self.room.room_id, 8) + b(self.room.command_queue_length, 4) + b(player.player_id, 8) + b(song_idx, 2) + b'\x06\x06\x06\x06\x06\x06'
+
+    def command_10(self):
+        # 房主宣告
+        return b'\x06\x16\x10\x09' + b(self.room.room_id, 8) + b(self.room.command_queue_length, 4) + self.random_code + b(self.room.host_id, 8)
+
+    def command_11(self):
+        return b'\x06\x16\x11\x09' + b(self.room.room_id, 8) + b(self.room.command_queue_length, 4) + self.random_code + self.room.get_players_info() + b'\x08\x08\x08\x08\x08\x08\x08\x08'
+
+    def command_12(self, player_index: int):
+        player = self.room.players[player_index]
+        return b'\x06\x16\x12\x09' + b(self.room.room_id, 8) + b(self.room.command_queue_length, 4) + self.random_code + b(player_index) + b(player.player_id, 8) + b(player.character_id) + b(player.is_uncapped) + b(player.difficulty) + b(player.score, 4) + b(player.timer, 4) + b(player.cleartype) + b(player.player_state) + b(player.download_percent) + b(player.online)
+
+    def command_13(self):
+        return b'\x06\x16\x13\x09' + b(self.room.room_id, 8) + b(self.room.command_queue_length, 4) + self.random_code + b(self.room.host_id, 8) + b(self.room.state) + b(self.room.countdown, 4) + b(self.timestamp, 8) + b(self.room.song_idx, 2) + b(self.room.interval, 2) + b(self.room.times, 7) + self.room.get_player_last_score() + b(self.room.last_song_idx, 2) + b(self.room.round_switch, 1) + b'\x01'
+
+    def command_14(self):
+        return b'\x06\x16\x14\x09' + b(self.room.room_id, 8) + b(self.room.command_queue_length, 4) + self.random_code + self.room.song_unlock + b'\x08\x08\x08\x08\x08\x08\x08\x08'
+
+    def command_15(self):
+        return b'\x06\x16\x15\x09' + b(self.room.room_id, 8) + b(self.room.command_queue_length, 4) + self.room.get_players_info() + self.room.song_unlock + b(self.room.host_id, 8) + b(self.room.state) + b(self.room.countdown, 4) + b(self.timestamp, 8) + b(self.room.song_idx, 2) + b(self.room.interval, 2) + b(self.room.times, 7) + self.room.get_player_last_score() + b(self.room.last_song_idx, 2) + b(self.room.round_switch, 1) + b'\x09\x09\x09\x09\x09\x09\x09\x09\x09'
diff --git a/latest version/web/__init__.py b/latest version/web/__init__.py
new file mode 100644
index 0000000..e69de29