S.T.A.L.K.E.R. - Great FPS with RPG and exploration elements
Bioshock - FPS with great atmosphere
Magica - inovative indie action adventure/top down shooter game
X-Com/UFO: Enemy unknown - the best squad based turn based tactical game around
Batman: AA -great action adventure game and a must for all batman fans
Mount & Blade - best open ended medevil war simulator RPG ever
Alpha Centauri - the best non sequel Civ game ; )
Knights of the old republic - a must for any Star wars fan
The Witcher - one of the best uses of morality in a modern RPG
Portal - it's one hell of a special first person puzzle adventure
Minecraft - An open ended mining/building/adventure sim
Prince of Persia: the sands of time - still one of the best 3D action adventures ever made
Dead Space - 3rd person shooter horor game
and that is all i can think of at the moment
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