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The game costs about $160 as of June 2004 due to the fact that the box includes the expensive USB biofeedback hardware which hooks up to your fingers. This is the hardware that helps teach you to manage stress, as most puzzles require you to control things such as your heartbeat to progress through the game.

Contributed by Zack Green (1185) on Jun 13, 2004. [revised by : Patrick Bregger (232698)]. -- edit trivia