Puyo Puyo Tetris is a puzzle game developed by Sonic Team and published by Sega. The game is a crossover between the Puyo Puyo series and the Tetris franchise, and features various gameplay modes incorporating both aspects. The game includes characters modeled after the seven Tetriminos, which are different puzzle pieces each made of four blocks. Puyo Puyo Tetris was the first Tetris-related title published by Sega since Tetris Collection, an installment in the Sega Ages series, in 2006, eight years prior. Puyo Puyo Tetris adopts the guidelines used in current Tetris titles, so the rotation patterns and colors of the Tetriminoes differ from Sega's previous releases.