Prism Studios created Portal Stories: VR, a mini story set in the Portal Universe. You can download the game over here, it's available for free but you do need a HTC Vive headset to play.
Portal Stories: VR builds on the foundations of the award winning Portal 2 modification Portal Stories: Mel.
Portal Stories: VR is a brand new mini story set in the Portal Universe. It features 10 brand new puzzles, specifically designed to work using the 360 degrees room scale that SteamVR offers. Inside Aperture, you'll be able to use the new "Aperture Science Instant Teleportation Device" and the "Aperture Science Apparatus Retrieval Tool" to solve the new tests.
Powered by Unreal Engine 4, Portal Stories: VR gives the Aperture Science facility a whole fresh look. With new models, textures, particles and more!