Look at it! Look at it! LOOK AT IT!

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from https://www.suppermariobroth.com/po.../model-of-diddy-kong-from-a-prototype-for-the
 
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A series of glitches can be used in Super Mario World to cause Mario's internal power-up value to increase past the intended limit, causing various visual effects such as his palette changing. One notable effect is that Balloon Mario will appear to have his eyes wide open (right), compared to his regular sprite where he is squinting (left).