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was a video game software publisher headquartered in the United Kingdom, owned by Mirror Group Newspapers.
It was founded as a publisher of educational software before moving into games. Mirrorsoft's most famous (and infamous) product was Tetris, the computer rights to which were acquired in a series of complicated licensing issues.
All of Mirrorsoft's Sega games were published either through Arena or Image Works. The company was bought by Acclaim Entertainment in 1992.