You can "unlock" this mode by typing in X&BUTT or WSWWAEAW, a Cheat Code, as your name. Afterwards, you will have to rename yourself something else that isn't another cheat code, as you can only enter one cheat code per file. Upon doing so, your save file will have a dark blue pumpkin on the left side of the picture of the character (Plague, Specter or Shovel). The pumpkin is a reminder that means:
- You don't benefit aside from laughs.
- Feats cannot be obtained for that file.
- You inputted a Cheat Code. Cheater, cheater, pumpkin eater!
"Butt mode," changes none of the gameplay nor the story. Although it does change one thing; by that, it actually changes several dialogue words used repeatedly and replaces them with "butt", some of those words being:
Every piece of text with those words will be replaced, except for the ones used in your inventory.
Yes, you read that right, Shovel Knight is called "Butt Butt."