“You didn't listen, I'm amazed, so now your game pak is erased!”
—Gruntilda Winkybunion, Banjo-Kazooie
Grunty's Code Vengeance is when Grunty erases your game file because you entered too many "illegal" cheats in Banjo-Kazooie. You may only enter a maximum of two illegal cheats in the Sandcastle floor. If you try to enter a third cheat, Bottles will gives you a heads up warning you that your save file will be deleted. Any cheat that involves opening a level or a note door without a puzzle or moving obstacles in Grunty's Lair is considered illegal. Cheats involving Stop 'n' Swop are not considered illegal and do not affect this. The Xbox Live Arcade version of the game seems to be unaffected by Grunty's deletion.
When you see Grunty erase your file, it is not erased right away. Only when you save and quit, lose all lives or turn off the power does this effect apply. You can continue to play the game at your own leisure until you turn it off, receive a Game Over or reset it.
- If you choose to already have the basic moves at the beginning of the game as opposed to learning them from Bottles, then talking to him in Spiral Mountain repeatedly will cause him to threaten to erase your game pak. Unlike Grunty's Code Vengeance though, he will not do it.
- This can be bypassed using ASM codes like Gameshark codes that are designed to use illegal cheats without the Game pak being erased.
- Grunty's ability to erase your game pak doesn't appear to have the desired effect in the Xbox 360 version, as seen in a video on the subject in which the affected save file is still intact on the Xbox 360 version. It does, however, work as intended in the N64 version.