「レッスン」
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Tetris （R）& ©1985~2020 Tetris Holding.
Tetris logos, Tetris theme song and Tetriminos are trademarks of
Tetris Holding.
The Tetris trade dress is owned by Tetris Holding.
Licensed to The Tetris Company.
Tetris Game Design by Alexey Pajitnov.
All Rights Reserved.