Dragon Quest V (SNES)

Dragon Quest V is, as you may have guessed, the fifth Dragon Quest title. While it was unreleased outside Japan until its remake for the Nintendo DS, there are fan translations for both the original Super Famicom game and its PlayStation 2 remake.

Debug Mode
The incomplete Game Genie code will activate a Debug Mode of sorts in the Japanese version. Holding B activates a walk-through-walls mode.

When you bring up the menu with A then select the second option, a fifth option for opening a debug menu is added. However, it crashes the game because this cheat code is incomplete.