It has been 13 years since Paper Mario: The Thousand Year Door was released on the Nintendo Game Cube and finally, the debug code to access the game’s debug mode has been discovered.
Discovered by @PistonMiner, debug mode allows users to access crash reports in the event the game crashes.
Pressing XBRBYL on the title screen of Paper Mario TTYD enables debug mode, you can confirm by holding Z on the main menu to show the date the game was built. Also enables crash reports when the game crashes. I am not aware of anyone else who has discovered this in 13 years time.
— PistonMiner (@PistonMiner) April 9, 2018
This goes to show how well some well-hidden secrets can hide. If you know any secrets from other games that you would like to share, do let us know!