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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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In Super Mario Sunshine, Mario's blinking speed is proportional to his movement speed. When walking slowly, he will blink slowly. By tilting the Control Stick extremely slightly, Mario will close his eyes for several seconds every time he blinks.
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In Super Mario Bros. 35, a glitch allows courses that have not yet been unlocked to be selected. If Down and A are pressed on the same frame, the course below the currently selected one will be chosen, even if it is not unlocked yet. Note how I select 5-2 and 6-2 is then chosen.
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In Super Mario 64, falling into sand or snow from a great height gets Mario stuck. However, the geometry of the courses that contain them also mistakenly designates some other surfaces as sand or snow, resulting in Mario being able to get stuck in stone or ice.
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In the Super Mario Maker games, a Goomba trapped between blocks will send undulating waves of direction changes up the stack it is carrying. This can be used to create towers of cannons that each shoot left or right in an unpredictable manner.
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In the Tall, Tall Mountain slide in Super Mario 64, several glitches can work together to create a shortcut. If C-Up is pressed as Mario starts sliding, he will gain speed, get caught on a wall, reverse, fall off a track segment that fails to load, and can skip most of the slide.
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In Super Mario 64, the eel is never seen leaving the sunken ship in Jolly Roger Bay: it is either inside it or swimming around. By holding C-Up to force the camera to look down while swimming away, we can see the eel simply teleports out of the ship once Mario is far enough away.
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In Super Mario Sunshine, worried Toads are only worried when Mario approaches, and smile when he is far away. This was not visible in the original release due to the resolution, but the increased fidelity of the Super Mario 3D All-Stars version allows this to be seen on console.