Telepathy
Platform: Atari 2600
Region: Prototype (USA)
Media: Cartridge
Controller: Joystick
Gametype: Prototype
Release Year: 1983
Developer: Atari
Publisher: Unreleased
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Telepathy is one of two known prototype games that were developed for Atari's failed Mindlink controller.  The Mindlink was a headband that player wore on his head and plugged into the joystick port.  The idea was that the Mindlink's sensors would pick up any facial movements or muscle twitches the player would make.  Atari actually said that the Mindlink read the player's thoughts (sure it did...).  The problem was that the Mindlink didn't work very well in initial test runs, and even when it did work players would complain of headaches and dizziness from twitching their face all day.  After disappointing test results, the Mindlink controller was wisely canceled. 

Unlike most games of the time, Telepathy has a demo mode which will run through all the screens if the game is left untouched.  Interestingly you can control the player in the demo using the joystick, it's unknown if this was intentional or just a bug.  The game starts off with a really cool sign which descends from the top of the screen telling you which mine your on.  After that you're whisked off to the first screen.

http://www.atariprotos.com/2600/software/telepathy/telepathy.htm
