Nintendo Tumbler Puzzle

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Type	Puzzle
Inventor(s)	Gunpei Yokoi
Company	Nintendo
Country	Japan
Materials	Plastic

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.