A great indie game. You can make choices (helping the ezic, accepting the poor people's passport's) and the game has 20 ending depending on your decs.

Garry's mod is the BEST sandbox game on Steam and has awesome physics, so many addons, and fun community game modes.

This is a fun indie game where you must escape from different prisons and is very well put together. The community for this game makes great maps!

If you like futuristic games, then PS2 is good for you! Planet Side 2 is a great game and you would be surprised how many people show up to the fight!

Personally my favorite out of the Counter-Strike series. CS:S is a great game with old fashioned graphics and some neat features.

Team Fortress 2 is another first person shooter that centers more on mayhem than strategic approaches, however you might be able to organize someone!

Counter-Strike: Global Offensive is a first person shooter with a lot of competition, has a higher skill cap, and is big around the market and trading.