Portal: Still Alive, developed by Valve Software, is an award-winning action game available for Xbox One. In this game, players are unwilling test subjects in a sinister laboratory where they must break the laws of physics using ‘portal’ technology to solve puzzles and survive. By unlocking the full version, players can experience the complete singleplayer story, gain access to all 14 new bonus maps, and get a glimpse behind the scenes with developer commentary.

The game is a thrilling combination of puzzles and action with a unique storyline. The graphics are impressive, and the game mechanics are smooth and responsive. The puzzles are challenging, but not frustrating, and the game's soundtrack is catchy and fitting. Overall, Portal: Still Alive is an excellent game that will keep players entertained for hours.