After you have found all of the blue prints for schnider, press the minigame option and when you get to select the game, press the A and B button togeter at the same time... it will take you to a room that was probably used as a test room when the game was created by nintendo. There is a donkey kong figure near the center and four pillars that your can stand on... there is nothing special to do here, besides being able to shoot a banana baloon, in order to get out of the room you must turn off the power (this doesnt effect your saved data.)