The cake is a lie!

Portal is one of the most slyly wicked games of the year, which was slipped into the Orange Box release.

The game is simple: make portals. Go through portals. Complete tests administered by GLaDOS, your friendly AI host. Think about the promise of cake. Try not to let GLaDOS kill you as you find out she's quite...fucking insane. Get regaled by the best song in game history once you "beat" GLaDOS.

I'm not a huge gaming fan, but Portal is unique, funny, surprising, brain-teasing and highly rewarding to play.