System Shock 2 is a really good game theres a patch that makes it co-operative multiplayer with up to four players makes it even more fun.
Rebirth Mod (replaces ingame models with higher detailed ones)
http://www.fileplanet.com/125428/120...Rebirth-Beta-1
http://www.strangebedfellows.de/inde...topic,8.0.html
Patch
http://www.fileplanet.com/23381/2000...-Shock-2-Patch
Also Deus Ex is a really good game the multiplayer System Shock 2 is even better
