Portal: Still Alive is now free via Games with Gold for those Gold subscribing members on Xbox One or Xbox 360. Grabbing the license for the game will allow players to enjoy the full experience of the game while they're subscribed. It will be available on Games with Gold from June 1st to 15th 2019. It's a decent size game taking a total of 1.32 GB on your hard drive. You can view all the currently available GWG games here as it will be joined by EA Sports NHL 19 on Xbox One during the first part of the month. This title is also Xbox Backwards Compatible so it can be played on Xbox One along with any and all DLC.
The game was published by Valve and developed by Valve. It is Xbox One X enhanced with 9x the pixel count for a 4k resolution. Deal with a strange machine as you aim to make giant portals of bright colors in order to solve problems and survive another day under intense testing procedures.