This thread exists to catalog most of the debug stuff I've found in Gamtec games. These range from music/SFX test screens, stage select screens, to debug info shown during gameplay or RAM viewers. These aren't meant to be accessible normally since they're either dead code (not jumped to or called at all) or behind a RAM value that never gets set.
To start this thread off, here's a screenshot of the stage select from Pocket Monsters. This screen also exists in other games made with the Mulan platforming engine (excluding the Donkey Kong games). The text itself is stored in ASCII inside the ROM and is displayed with the Sonic the Hedgehog debug font, which is probably the first time the font ever gets used since its first appearance in the ROM of Tekken 2
You can access it in Pocket Monsters using the Game Genie cheat codes: RE3T-C614+RE3T-C616+RE4A-C6TY+RE4A-C6T0
