In a press release following some rumors this morning, it seems the famous Half-Life mod that created a franchise and an online community is coming to XBLA with Counter-Strike: …
Portal: Still Alive was developed by Valve and published by Microsoft. Portal was released November 22, 2008 and cost 1200MSP.
In Portal you are a subject in a test study; not by choice. You are given a ‘portal gun’ and forced to defy the laws of physics in order to escape each test room. Equipped with just the ‘portal gun’ and your wits, it is your task to figure out how to avoid all the obstacles that stands in your way.