Half-Life: Alyx is a virtual reality game set in the Half-Life universe, where players control Alyx Vance as she fights against the Combine's occupation of Earth. The game is built from the ground up for VR and supports various play environments, locomotion methods, and input devices. It also includes a set of Source 2 tools for building new levels, allowing players to create and share custom environments. The game is available on Steam and is compatible with any SteamVR-compatible headset.