Team Fortress 2 is the sequel to the game that put class-based, multiplayer team warfare on the map. It delivers new gametypes, a signature art style powered by Valve's next generation animation technology, persistent player statistics, and more.
I love TF2, mostly because of how you can customize your class to your liking, with different hats, weapons, etc. It's a very fun class based game with neato Cartoony graphics and awesome gameplay. There are nine classes in TF2, Scout, Spy, Sniper, Heavy, Soldier, Medic, Demoman, Pyro, and Engineer, each with their own unique gameplay style. There's a lot to do in TF2, and with all the community created content including maps, gamemodes, even mods, there's no reason not to try this game. "The most fun you can have online.." is now free, so come on in and enjoy what TF2 has to offer.