Portal: Still Alive
Portal: Still Alive is a 2008 Xbox Live Arcade release of 
Portal. It is very similar to Portal on The Orange Box (Xbox 360), and includes additional levels based on Portal: The Flash Version but different achievements from Portal released on the The Orange Box (Xbox 360).
The game can be run on Xbox One hardware, and is rendered at 4K on Xbox One X and Xbox Series X.
The exclusive levels were later ported to PC by fans as a mod. And, despite not being mentioned in the store page, it was later included in the 
Nintendo Switch version of the game (
Portal Companion Collection), likely due to the port being based off the Xbox 360 version of the game with Source 2013 Singleplayer code (as indicated by the Gamerscore leftovers in the achievements menu).
See also
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