Tengen is the name of the company that made and had its own branding on unofficial Nintendo entertainment games.
It was incorporated on December 21, 1987. In 1988, Tengen emitted its first and only three games authorized by Nintendo: R.B.I. Baseball, Pac-Man, and Gauntlet. Meanwhile, Tengen privately worked to avoid Nintendo's lock-out chip called 10NES which granted it control over which games were published for the NES.
Nintendo Co., Ltd. is now the biggest video game business by revenue, as a Japanese multinational customer electronics corporation headquartered in Kyoto, Japan.
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