You probably know about games project in openSUSE Build Service, but that what you probably don’t know, there is one game called 0verkill. It is bloody 2D action deathmatch-like with ASCII-art graphics. It is possible to play this game from Xorg with x0verkill client, but from terminal as well with client 0verkill. This is network based game, but if you want it, you can play this game at local server and you can create a lot of other players with program 0verkill-bot. If you want to play this game with real players, feel free connect to server auryn.karlin.mff.cuni.cz, if nobody there, try ask players at 0verkill IRC channel at Freenode.
