This is an old game but it has got GOTY many many of times. Highly recommend.
Quick Extract from steam Info
- Choose from 3 specialized branches of the military to utilize unique skills, weaponry, and paranormal psionic powers.
Upgrade and enhance your skills to improve hacking, weapon proficiency, and psionic abilities.
Discover cryptic audio logs, encounter ghostly apparitions and conduct research to give you the advantage in combat and unlock exotic weapons and items.
Play with up to three friends in multiplayer co-op (co-op currently works in Windows only)
System Shock™ 2 is a genre defining experience that established innovative game-play mechanics that are a staple of the FPS and RPG genre today. It has gone on to inspire some of the greatest titles of our generation with games including Deus Ex® and Bioshock®
Discover how a haunting story, innovative game-play and a terrifying atmosphere has made System Shock™ 2 one of the greatest games of all time.
No longer $2