CheatCodes.com has all the official Um Jammer Lammy PSX cheats to unlock everything. If you know of any that we don't have, please let us know.
All published and official codes as of Wednesday June 19, 2013 for Um Jammer Lammy are shown below.
Load the game, then immediately reset the PlayStation when Lammy appears at the title screen. Then allow the game to reload, and a new menu will appear next to Lammy's guitar at the title screen. Use those options to customize the lyrics and notes.
Successfully complete all levels in the game, including the Lammy and Parrappa levels. Then, select the "Special" option at the title screen to display a new menu that allows all music to be played while all game characters are dancing under your control.
Successfully complete all of the bonus Parappa levels.
Successfully complete the game, then return to the level selection screen. Press Right until the bonus Parappa levels appear.
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