Portal: Still Alive

Portal: Still Alive is the stand-alone Xbox 360 version of Portal with a few changes compared to the previous release of the game as a part of The Orange Box.

The quality of the graphics has been downsized to meet the restricted game size of Microsoft's XBLA service. In addition, fourteen more levels have been added based on the fan game Portal: The Flash Version, of which the levels were afterwards adapted to the 3D Source engine design of the original game. The new levels do not fit into the storyline and do not involve GladOS as an omniscient companion. That extra content was made available to the owners of the original Windows game for free. This version also includes developers' commentary.