favorite steam game.

[Fortok]

Team Fortress 2 for being an incredible entertaining game.

 

[DevilSShadoW]

Pretty much that. Only game that actually cheers me up even when i loose badly.

 

[SeksEin]

Either Team Fortress 2 or Garry's Mod for me.

 

[Pipotchi]

X3 Terran Conflict for me, I love that game

 

[NuclearPenguin]

Seconded.

Thirded. Only FPS game I can come back to and it never gets boring.

Fourthed.

Fifthed (?)

 

[GrinningManiac]

This

Also, because they released Evil Genius on STEAM recently, I'm gonna be a sneaky little bastard and say That