HoloDust 3 days ago
Well, by sales alone, Wii Balance Board (42 millions). As someone who still has it, it was always fun accessory, both for fitness and actual games.
By both sales (35 millions) and actual transformative power of making standard home console into something quite different, I'd go with Kinect.
By transformative power alone, I'd go with something VR, cause that opens up pretty much everything.
