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On the World Map pause screen after finishing the game, if you press L/R/L/R/X/X/Y/Y, a secret Challenge Mode will be enabled that disables scrolling backwards in levels, making the gameplay more similar to Super Mario Bros., Super Mario Bros.: The Lost Levels, and Super Mario Land. Inputting this code again on the World Map pause screen disables this mode.
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Tapping letters as the credits roll will make unique sound effects play. These effects are heard throughout the game, and each letter has its own sound (except for letters D and E, which share the same sound). The letter Q is never seen during the credits and thus has no sound.
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The name "/script/game.bmg/msg 7" has text that says "You can't save here. Do you want to quit?" which is only used during certain undetermined circumstances.
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