Cancel join, while running Game on different Server

At first, hello all here!

In example i have two server: main, game-server
I want:
While the game on game-server is running, i can't join this server from main server.
I want the "Kicked whilst connecting to game-server: "Reason"" message, that will send from Bunggecord, i'm think.
I don't want to kick the joining player from server, because, than he is kicked from bungee server, and must connecting again.
Many other server have this, too.
How can i do this now?
Must i code a plugin for bungee, that looks, if the server is running a game, or can i do this over bukkit?

 

Si1lve3r You'd be better off seeking support where you acquired your server mod.

 

You may want to start by looking at the PlayerLoginEvent on your game server.

 

Si1lve3r
Just make on your game-server a player login or join event, and kick the player if the game is running!
Else look at spigot, because there can you find stuff for bungeecord

 

And as AdamQpzm said correctly, ask for support where you gotten your build. BUKKIT forums are made for BUKKIT