Tetrisphere is a puzzle video game developed by H2O Entertainment and published by Nintendo for the Nintendo 64. It was released in North America on August 11, 1997, and in PAL regions in February 1998. The game, originally named Phear, was slated for release on the Atari Jaguar in early 1995, but was reworked into a Tetris game for the N64 after Nintendo obtained its publishing rights. Tetrisphere is a variant on Tetris in which various shapes are shifted across a wrapped three-dimensional grid resembling a sphere, and then destroyed. The objective of the game changes depending on the mode but generally consists of removing layers of shapes to reach the playing field's core. Despite very little domestic advertising, Tetrisphere enjoyed moderately good sales and a mostly favorable critical reception. Reviewers praised the game's originality and the musical score composed by Neil Voss.