Valve’s virtual reality adventure continues, with the company’s latest invention, a VR controller called Knuckles EV2, heading to developers this week. To show off the controller, the company has made a tech demo named Moondust, and it’s set in the Portal universe.

Moondust is an interactive experience set–you guessed it–on the Moon. It sees you crushing rocks with your hands–designed to showcase the pressure sensitivity of Knuckles–as well as driving buggies, throwing objects at targets, and assembling space stations.

It’s not yet clear if Moondust will see a commercial release; right now, it’s simply intended to show third-party developers the kinds of things the controller can achieve. For more on the demo, check out the Steam blog or the short trailer above.

Even though we haven’t seen a full Portal release since 2011’s Portal 2, there’s been a number of tie-ins and bonus content from the series since then. Last year, we got a crossover with the Bridge Constructor series, named Bridge Constructor Portal. Before that, Rocket League received Portal-themed DLC and Valve’s series also made an appearance in Lego Dimensions (including one Easter egg never seen in the main Portal games). A Portal movie is also in development from Star Wars: The Force Awakens director JJ Abrams, though there has been no update on that since September 2016, when Abrams said he hoped the film would be fully revealed soon.