I loaded the string into a hex editor while running Have A Nice Death build 0.7.2. Here is what happened:
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.
As a roguelike, Have a Nice Death features procedurally generated levels where death sends the player back to the start, requiring them to rebuild their power for the next "run."
Let’s dissect the string piece by piece:
--v65536-- : This is the smoking gun. 65536 is not a normal version number (v1.2.3 is normal). This is 2^16—a max value for a 16-bit integer.
US... : Region lock? Or “Unlimited Sorrow”? The trailing ellipsis suggests the string was cut off. What comes after US? US-EAST? US-UNDEAD?