Valve has unveiled a free spin-off of Portal called Aperture Desk Job.

This “interactive tutorial” will be available to download from March 1, and will introduce new Steam Deck owners to the device and its capabilities. Reportedly, playing the game only takes about twenty minutes.

Valve emphasizes that it is absolutely not about Portal 3. “Limit your expectations. This isn’t a sequel to Portal. But raise your expectations a bit, because it does expand the universe of those games.”