If you saw this string in a file name, console error, or CD key field, it is almost certainly a technical identifier — not something you input in-game. It could be from a cracked version, a developer debug menu, or a corrupted update file on the Switch.

Do not attempt to use it as a cheat code. It will not unlock anything.

Go to:
%LOCALAPPDATA%\HaveANiceDeath\Saved\
Delete D3DDriverByteCodeBlob and ShaderCache

On Nintendo Switch, every game has a unique 16-character hexadecimal Title ID. For Have A Nice Death, the Title ID on the eShop is:

0100125019A14800

Thus, the first part (-0100125019A14800) matches exactly with the Switch version’s Title ID, often seen in save data folders, update logs, or error reports.