Rez is a musical rail shooter developed by United Game Artists and published by Sega for the Dreamcast.

Rez is a video game that combines mechanics from the music game genre and rail shooters like Panzer Dragoon. Players take the role of a hacker infiltrating a malfunctioning artificial intelligence and fighting off viruses and corrupted security programs. Destroying data nodes in each level raises the "layer level" to a maximum number of 10. Raising a layer level changes the background music, layout, and enemies of a level. There are five levels, dubbed Areas, although at the start only four can be accessed. Achieving 100% leveling score for the first four areas of the game unlocks Area 5.