Portal, Half-Life, and Team Fortress developer Valve is working on a number of virtual reality projects.

The company's president, Gabe Newell, confirmed the news to Eurogamer. "Right now we're building three VR games," Newell said, according to the site.

When asked about Valve's prototype HTC Vive experience The Lab, Newell replied, "When I say we're building three games, we're building three full games, not experiments." Newell revealed the projects are being developed in Valve's own Source 2 engine and Unity.

The Valve founder went on to say his company has working VR builds of some of its back catalog: "One of the first things we did is we got Half-Life 2 and Team Fortress running in VR, and it was kind of a novelty. That was purely a developer milestone, but there was absolutely nothing compelling about it, the same way nobody's going to buy a VR system so they can watch movies."

It remains unclear what the developer's three current VR projects are. It's also unknown what platforms those games will be playable on; Valve partnered with HTC to build the Vive, but Newell has previously said he believes exclusives, especially VR exclusives, are bad for gamers, and risky for developers.

"There are a lot of different forms of risk," the long-time Valve executive said in 2016. "Financial risk, design risk, schedule risk, organizational risk, IP risk, etc. A lot of interesting VR work is being done by new developers. That is a triple-risk whammy--a new developer creating new game mechanics on a new platform."

For more on Valve's dabblings in VR, check out our HTC Vive review.