diff --git a/parts/gametoolfunc.lua b/parts/gametoolfunc.lua
index 51046fb6..e4475c93 100644
--- a/parts/gametoolfunc.lua
+++ b/parts/gametoolfunc.lua
@@ -1154,6 +1154,8 @@ do
 									USER.id=res.id
 									USER.authToken=res.authToken
 									NET.getAccessToken()
+								else
+									SCN.back()
 								end
 								FILE.save(USER,"conf/user","q")
 								LOG.print(text.loginSuccessed)
@@ -1164,12 +1166,14 @@ do
 								USER.accessToken=res.accessToken
 								LOG.print(text.accessSuccessed)
 								NET.wsConnectPlay()
+								NET.unlock("accessToken")
 							elseif res.action==1 then--Get userInfo
 								if res.id==USER.id then--Own
 									USER.name=res.username
 									USER.motto=res.motto
 									USER.avatar=res.avatar
 									FILE.save(USER,"conf/user")
+									NET.unlock("getSelfInfo")
 								else--Others
 									LOG.print("Get user info: "..USER.id)
 								end
@@ -1202,11 +1206,13 @@ do
 						local res=JSON.decode(message)
 						if res then
 							if res.message=="Connected"then
+								NET.unlock("connectPlay")
 								SCN.go("net_menu")
 							elseif res.action==0 then--Fetch rooms
 								NET.roomList=res.roomList
 							elseif res.action==2 then--Join room
 								loadGame("netBattle",true,true)
+								NET.unlock("enterRoom")
 							elseif res.action==3 then--Leave room
 								SCN.back()
 							end
diff --git a/parts/net.lua b/parts/net.lua
index bd51566e..3883b3c3 100644
--- a/parts/net.lua
+++ b/parts/net.lua
@@ -5,28 +5,48 @@ local NET={
 	roomList=false,
 }
 
+--Lock & Unlock submodule
+local locks={}
+function NET.lock(name,T)
+	if locks[name]and TIME()<locks[name]then
+		return false
+	else
+		locks[name]=TIME()+(T or 1e99)
+		return true
+	end
+end
+function NET.unlock(name)
+	locks[name]=false
+end
+
 --Account
 function NET.pong(wsName,message)
 	WS.send(wsName,message,"pong")
 end
 function NET.getAccessToken()
-	WS.send("user",JSON.encode{action=0})
+	if NET.lock("accessToken")then
+		WS.send("user",JSON.encode{action=0})
+	end
 end
 function NET.getSelfInfo()
-	WS.send("user",JSON.encode{
-		action=1,
-		data={
-			id=USER.id,
-		},
-	})
+	if NET.lock("getSelfInfo")then
+		WS.send("user",JSON.encode{
+			action=1,
+			data={
+				id=USER.id,
+			},
+		})
+	end
 end
 
 --Play
 function NET.wsConnectPlay()
-	WS.connect("play","/play",JSON.encode{
-		id=USER.id,
-		accessToken=USER.accessToken,
-	})
+	if NET.lock("connectPlay")then
+		WS.connect("play","/play",JSON.encode{
+			id=USER.id,
+			accessToken=USER.accessToken,
+		})
+	end
 end
 function NET.signal_ready()
 	WS.send("play","R")
@@ -56,7 +76,7 @@ function NET.createRoom()
 	WS.send("play",JSON.encode{
 		action=1,
 		data={
-			type=nil,
+			type="classic",
 			name=(USER.name or"???").."'s room",
 			password=nil,
 			conf=dumpBasicConfig(),
@@ -64,14 +84,16 @@ function NET.createRoom()
 	})
 end
 function NET.enterRoom(roomID,password)
-	WS.send("play","/play",JSON.encode{
-		action=2,
-		data={
-			rid=roomID,
-			conf=dumpBasicConfig(),
-			password=password,
-		}
-	})
+	if NET.lock("enterRoom")then
+		WS.send("play","/play",JSON.encode{
+			action=2,
+			data={
+				rid=roomID,
+				conf=dumpBasicConfig(),
+				password=password,
+			}
+		})
+	end
 end
 
 --Chat