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In Super Mario Maker 2, Music Blocks have unique sounds for objects that cannot be directly placed in the editor or cannot normally activate the blocks. This footage gives a few examples: shell-less Koopas, Bowser's falling flames and a 10-coin, which needs a POW Block to fall.
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In Super Mario Galaxy, whenever Mario stands directly underneath a point of interest, like a Grand Star, the game will attempt to make him look over both of his shoulders at once. This will result in him raising his shoulders one at a time in a rhythmic motion.
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The Super Mario All-Stars version of Super Mario Bros. has unused debug functionality to replace Mario's sprite with a blue rectangle reading "PLAYER". The rectangle also becomes red when Mario turns into Fire Mario.
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In Super Mario Maker 2, exploiting the fact that doors can be placed behind Bullet Bill Blasters and On/Off Switches can be placed behind Skewers allows the creation of secret doors that require jumping in an inconspicuous place to uncover.
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