Xbox LIVE Arcade has gone through a rough patch in recent weeks, failing to match the highs of the summer period, but that looks set to change next week. If you still haven't played Valve's fiendishly clever first-person puzzler Portal, from October 22 you'll be able to buy it from the Xbox LIVE Arcade.

Portal: Still Alive will set you back 1200 MS Points, but that gets you the full original game and 14 exclusive challenge maps that you'll only find in the Xbox LIVE Arcade version of the game.

For more on Portal head over to our review from last year.