I'm surprised nobody said FarCry. I love that game...

i got the 64bit version and it was so screwed up, havnt played it since..

Commander Keen!

That's really old school!

At this point in time: Half-Life 1 + 2 + and Episode One. Episode Two will be released on October 9th.

Try DEMOS of most games to avoid buying something u don't like

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Unreal Engine based games! Multiplayer FPS of course

Tactical Ops (Favorite)

Unreal Tournament '99(aka Goty) Lot of maps mods etc..

Unreal Tournament 2004

Tactical Ops Crossfire (Still Beta but sweet)

America's Army

Other Engines FPS

Wolfenstein- Enemy territory

World Of Padman

cel-shading or toon shading FPS

XIII Also known as: 13, Thirteen

Warsow

Car racing Simulator

LFS (Live For Speed)

Tiny 2d mario like

Knytt

AVOID Counter Strike to many cheaters at unbearable levels, + a pain to install ( s*cks but that is my personal view)

PEGGLE ;P

Seriously, Take your time choosing for a good game. Read reviews and such.

Try CS ( counterstrike ) .