No More Heroes Cheats
Bitter Difficulty Setting
First you have to complete the game on the Sweet or Mild difficulty settings, then watch the credits and create a new game save. After that you can start a new game on the Bitter difficulty setting along with all of your equipment from your previous game.
Complete the game with all beam katanas to view the game's true ending.
Unlock Shirt 00
Complete the game once
Complete the game once and create a new save file. Loading this save file retains the old file's money and clothing. New shirts will also be available at Area 51.
Unlock Pure White Giant Glastonbury mini-game
Complete the Rank 04 battle to unlock the Pure White Giant Glastonbury mini-game from the motel TV.