8. Sega Activator
This Octagon-shaped add-on was about as popular as Streets of Rage 2 was on the 16-bit gaming machine. Laid on the ground, the Activator read your actions using infrared lasers which when broken corresponded to a movement in direction. It didn't work very well, had a complicated control scheme and had to be calibrated every time you restarted it.
We're working to fix the problem right now and will have it working as soon as possible