Im Still Trying to add multiplayer and sneak peek at level 6 killer

Im Still Trying add multiplayer the thing is the plugin for steam advance session doesn't work that y i had troubles but there are other plugins to add multiplayer and thats what im trying to do its hard but ill will try wish me luck. level 6 will be in the backrooms Maby. And Im Still Working on Level 5. And Thats level 6 killer.