Tetris: The Grand Master 4 - The Masters of Round, is an unreleased sequel to the TGM series created by Arika. It was announced in 2009 by Arika vice president Ichiro Mihara, and unveiled at Sega's Amusement Machine Show the same year.
The game's release has been in limbo, citing various problems reaching an agreement with publishers or The Tetris Company.
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