Just received your new Steam Deck and need a way to verify all the hardware is working? Valve has you covered with Aperture Desk Job, a playable short set in the Portal universe. You'll take on the role of desk jockey, quality testing... toilets.
During the short 30 minute playtime, you'll be treated to some wonderfully comedic voice acting while confirming that all the controls on your Steam Deck are in perfect working order.
You don't need a Steam Deck to enjoy Aperture Desk Job however, so it's definitely worth play-through for everybody. A controller is required though, the Steam Controller worked well for me.
Oh, and it's also free!
Check it out on Steam.