Probably the best sandbox game available today

A must-have for anyone that's been following along with the series

A classic F2P game with pretty straightforward multiplayer gameplay

Dota is recommended just for being Dota

The game is still in Early Access, but I see huge potential for it. Runs like a potato on the latest high-end hardware, but still a good game.

Counter-Strike: Global Offensive is quickly growing into the king of all FPS games. You definitely do not wanna miss out on this beautiful game.