Valve’s march toward launching new virtual reality video games—perhaps up to three of them—got more interesting on Thursday with the announcement of an update to the company’s next official piece of VR hardware. After a quiet 2016 unveil, the “Knuckles” controller is back with a major revision.

Dubbed Knuckles EV2, the mold-to-your-hand controller is still a developer-only prototype, but a huge dump of official information reveals how far Valve has gone to craft what might be the ultimate VR controller: a smart twist on how hands work in virtual space and a bonus slew of buttons for older legacy games.