"Tetris: The Grand Master 4 - The Masters of Round" is an unreleased arcade sequel to the TGM series created by Arika. The features and content planned for this game would later be reworked as the basis for "Tetris: The Grand Master 4 - Absolute Eye," a Windows PC game set to release on Steam in early 2025. The arcade game was announced in 2009 by Arika vice president Ichiro Mihara, and unveiled at Sega's Amusement Machine Show the same year. It was exhibited again at public location tests in 2015 under a working title of "The Grand Master," omitting "Tetris" from the name due to lack of an active license. The game's initially planned arcade release was in limbo for over a decade, citing various problems reaching an agreement with publishers or The Tetris Company. Arika eventually secured a license for a home PC release after meeting a pre-condition of successful sales figures for the Switch and PlayStation 4 ports of "Tetris: The Grand Master" and "Tetris: The Absolute - The Grand Master 2 Plus."
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