I got my hands on a Japan import of RPG Tsukūru GB. It lets you make your own small rpg game for Gameboy color, when it came, I opened it to see i got 2 copies, the first one, was "Dragon Memory", it looks like a solid RPG. The next one looked like it was made by a five year old, you spawn in a random location, just to leave the map,and spawn in another random location, and go back to the old place, and to find 2 useless npcs, no enemies, and all while playing as a poop monster. (I'm NOT making this up.) I have no idea how to wipe one, and make my own game, it just takes me directly to the game, no builder of the sort, This thing is ancient, and I think this thing is oblivious to the internet, and had no guides online. If someone could help, I'd be grateful.

I'm sorry if this is posted in the wrong place, this is the only hope i have for making a small RPG game. So far I tried:
1. Hard reseting it.
2. Tilting the cart in a super game boy. It didn't work in it, and i guess it was just for Gameboy color.

Any help would be nice. If you need anymore details let me know.