A VR experience called Museum of Other Realities is currently free to own forever. As long as you claim a copy before the 21st June.
You will need a VR headset to play this game. However, you can add it to your Steam library even if you do not currently own a headset.
The Museum of Other Realities (MOR) is an immersive multiplayer art showcase in VR. Step into a painting, surround yourself with fantastic sounds, experience art with your friends as it evolves and takes form. The museum contains a growing collection of interactive art and experimentation, supporting artists who are challenging and redefining what is possible with virtual reality art.