Rez, developed under the codenames K-Project, Project Eden, and Vibes, is a rail shooter video game released by Sega in Japan in 2001 for the Dreamcast and PlayStation 2, with a European Dreamcast release and United States PlayStation 2 release in 2002. The game was developed by Sega's United Game Artists division, which contained several former members of the disbanded Team Andromeda, the Sega development team behind the Panzer Dragoon series. It was conceptualized and produced by Tetsuya Mizuguchi. His company, Q Entertainment released a high definition version, Rez HD to the Xbox Live Arcade in 2008.

The game is notable for replacing the typical sound effects found in most rail shooter games with electronic music, with sounds and melodies created by the player as they target and destroy foes in the game, leading to a form of synesthesia, enhanced by an optional Trance Vibrator peripheral.

A prequel, Child of Eden, has been released for Xbox 360 and PlayStation 3, published by Ubisoft. It is compatible with the Xbox 360 Kinect and the PlayStation Move motion controller.

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