Portal. Bundled with the outrageously reasonably priced Orange Box from Valve, this game has gone wildly viral on all of the Internets, for good reason. Think of all the games that have been released this year, and then know that Portal is the most original of them all. It is fairly short, but it is a stunning game. Brilliant in execution, with a really great sense of humour that sees you through right to the spectacular ending.

In a word, this game has character. So go get it.