Ten_Billion_Barrel
Nintendo Tumbler Puzzle
Mathematical puzzle
The Nintendo Tumbler Puzzle, also known as the Ten Billion Barrel in English and originally tenbirion (テンビリオン) in Japanese, is a mathematical and mechanical puzzle. It is one of many mechanical toys invented by Gunpei Yokoi at Nintendo. It was released in 1980 under U.S. patent 4,376,537. The patent expired in March 1995 due to non-payment of a maintenance fee.
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