Co-op mission/survival request

Hi guys.
I need a nice gamemode/ gamemode(with maps if possible)
something like zombie survival maybe? but for only 2-4 players, like, NPC zombie waves and you have to survive. Or a mission gamemode for 2-4 players.
Reply ASAP pls.

I wish they would be a good gamemode like this. The only one I know of is the WIP Nazi zombies gamemode I saw a video of.