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In page Alexey Pajitnov:

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Pajitnov created a sequel to Tetris, entitled Welltris, which has the same principle, but in a three-dimensional environment where the player sees the playing area from above.[11] Tetris was licensed and managed by Soviet company ELORG, which had a monopoly on the import and export of computer hardware and software in the Soviet Union, and advertised with the slogan "From Russia with Love" (on NES: "From Russia with Fun!"). Because he was employed by the Soviet government, Pajitnov did not receive royalties.[citation needed]