It's Counter-Strike, course you need this staple of gaming history, that's still very alive and kicking.

The basic core FPS mulitplayer game, though twiple is a casual type player, so it's a twiple-free game.

FRIGGIN LOVE THIS!

Very light and fun game if you don't follow the story too deep; elsewise if you do, YOU WILL GRIP THIS GAME SO HARD, YOU'LL HAVE ROBOT EARS!

I love the game's gameplay, simple in that it's easy to pick up yet, still able to pull off what you need if you provide the skill.

Also the MUSIC is AWESOME, hard to believe all this work was by one man, in his spare time.