ROMs that have been previously randomized cannot be used. To start, open an unmodified ROM of Metroid Zero Mission. Specific options for Text Randomization.Enabling custom music (Credit to JRP and Xl for the tracks).It is only compatible with the North American (U) version of the game. It can randomize palettes, enemies, enemy stats, text, and music. It has been expanded by Caption Glitch to include some additional options. Metroid Zero Mission Randomizer is a program initially created by biospark that allows you to randomize various aspects of Metroid Zero Mission, primarily item locations.