Atari Mindlink
The Atari Mindlink was an unreleased video game controller for the Atari 2600.
Intended for release in 1984, the Mindlink was unique in that one had to move the muscles in one's head to control the game. These movements would be read by infrared sensors and transferred as movement in the game.
Games would be similar to ones that used the paddle controller, but with the Mindlink instead. Two games were in development for the Mindlink by its cancellation, Bionic Breakthrough & Mind Maze. Bionic Breakthrough was basically Breakout controlled with the Mindlink, while Mind Maze was an attempt to use ESP through the Mindlink to predict what is printed on cards.
Testing showed that players frequently got headaches moving their eyebrows around to play the game.
Atari shelved the Mindlink. Neither of the games in development saw release in a joystick or paddle controlled form in later years, partly due to the failing video game industry and partly due to the games' limited appeal.