The large number of unlicensed NES games in North America was the result of the system's lockout chip in addition to disagreements with Nintendo's licensing policies. Atari formed a company called Tengen and wanted to port their arcade games to the NES but wanted to renegotiate the licensing policy. Nintendo simply said no and Tengen later acquired the blueprints for the lockout chip in order to release their games on the system without Nintendo's permission. Tengen later released the unlicensed version of Tetris and was pulled from shelves shortly after it was released, with Nintendo releasing their own licensed version of the game.
Submitted By: noidentity
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