At the title screen, enter the Continue menu. Once inside, you'll hear the girl tell you something about the RAM. If you press Button 1, she'll say it again. Repeat this 16 times and then hold Right + Button 2 + Start and press Button 1. If done right, you'll access the Debug Menu.
After the credits are over and the pink screen with the words "I will stay with you... forever" appears, hold Left + Button 1 + Button 2 and press Run. If done right, you will get numerous hidden visuals.
Skip Puzzle Games
While playing, when faced with a puzzle game, hold Button 2 and press Start to automatically beat the puzzle game.
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If you see a non-working or fake code in the list above, let us know by using our Problem Submission Form.