Portal gun. That is all you need to know in order to understand this game is like no other. Extremely challenging and impressive. Long lasting fun.

Very great game for free to play, especially without it being pay-to-win. This is a must have game.

You get to run around naked beating people with rocks, why wouldn't this game be a must have?

Felt like I was playing The Legend of Zelda from time to time, great indie game.

One of a kind FPS, combines silly antics, a dash of combat, and miscellaneous items to make it a great game.

Very creative game, extremely fun, and there are excessive amounts of sociability hidden in every server.

Hard to put down, better than the original.

Was completely immersed in the story line, great game.

Extremely great first person shooter, tactics are required if you wish to last long in this game. The ranking system is perfect too.

Can't play most of the Valve games without it, completes the games and adds more to them.