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.