Valve has now released its second piece of software for the HTC Vive virtual reality system: a free spectator hub for its hugely popular online-battling game Dota 2. While the Wednesday release isn’t a game per se, my brief test with the surprise-launched VR experience proves that this may very well be a game-changer for the system, and maybe even for e-sports.

The Dota 2 VR Hub got its first tease as early as this April, shortly before the Vive hardware saw its commercial launch, but word about the app dried up shortly afterward. And unlike other functions added to Dota 2, including a switchover to the Source 2 engine and Vulkan API support, this VR hub didn’t launch in a separate “test” branch or with any major “beta” indication. The mode requires a roughly 300MB installation, which can be toggled in the “DLC” list in the game’s Steam “Library” section.

What’s it like inside? Quite honestly, Dota 2 VR Hub is a total trip.