Tetris
01.05.1989
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Tengen, an Atari label, released an unlicensed version of Tetris for the Nintendo Entertainment System. After they lost a lawsuit to Nintendo, which acquired the rights from Russia to port the game to home consoles (they already had the handheld consoles rights), Tengen had to destroy every spare cartridge unsold at the time.
The Tengen game featured a two-player simultaneous mode not available in Nintendo's version
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Parent game
31.12.1988
Vs. Tetris is a game developed by Tengen for the Nintendo Vs. Unisystem arcade platform. The game would be the basis for Tetris (NES, Tengen) released some time later, and is noticeably less developed (e.g. the piece graphics use only solid colored or striped blocks).