Cube

[HotShot]

This game has always been a hit at LAN parties of mine. Often because of it's small filesize and low system requirements. It's a mad-fun fps at less than 30mb. You get about 50 maps, both singleplayer and multiplayer, full internet/LAN play, and a built-in map editor like no other. What's even cooler is that even the map editor is multi-player. This is the only game that supports co-op map editing.

 

The current PowerPC version works great under 10.4.3 with my Radeon 9600xt. Uses OpenGL, so make sure you have that available before you play.

 

http://wouter.fov120.com/cube/