Runners-up in no particular order: Bioshock Infinite, Devil May Cry HD Collection, Grand Theft Auto V, Pinball FX 2, Shadow Warrior, Spelunky, King of Fighters 13, The Stanley Parable, Lego Marvel Super Heroes
Game of the Year 2013: Dota 2
I'm aware that this has been available for a while, what with Valve giving out those beta keys like crazy, but since the official release date was only this year, I'm going to count it as a 2013 game, and it beats out everything else I played this year in terms of the thing that matters most: gameplay. Simply put, I have never played a game with such mechanical detail as Dota 2, and everything about it just fits together to create a near-perfect package. It's not a game for people without much patience, but if you're willing to put the time and effort into it, Dota 2 will reward you like few other games can.
Game of the Year 2013: Dota 2
I'm aware that this has been available for a while, what with Valve giving out those beta keys like crazy, but since the official release date was only this year, I'm going to count it as a 2013 game, and it beats out everything else I played this year in terms of the thing that matters most: gameplay. Simply put, I have never played a game with such mechanical detail as Dota 2, and everything about it just fits together to create a near-perfect package. It's not a game for people without much patience, but if you're willing to put the time and effort into it, Dota 2 will reward you like few other games can.