This weekend, I participated in the Nordic Game Jam in Copenhagen, Denmark. Tobii was sponsoring a bunch of eye-trackers, so I thought "Why not try to make a cool little multiplayer game with it?" So we did.

Blink Blink Boom is a reimagining of the childhood classic "Red Light Green Light." A group of players tries to reach the end of a corridor, and a solo player tries to stop them.

One player, called the Watcher, must use eye tracking to detect and eliminate players among a group of AI characters. To shoot characters, the DJ must close his eyes for a short duration to accumulate ammunition.

While the Watcher's eyes are closed, the players and AI have a window to rush towards the finish line, but if they are still running when the Watcher opens his eyes, they will be easily spotted and eliminated.

While the Watcher's eyes are open, the other players must synchronize their movement to the beat of the music, to keep in sync with the AI and remain ambiguously undetected.
Getting the Tobii eye-tracker to work with Unity was very easy. You can see a demonstration of the game here:

The game can be downloaded here (requires Tobii eye-tracker and a group of Xbox 360 controllers).