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X=9 (X equals 9) is a glitch associated with Super Mario Maker and Super Mario Maker 2 where assets placed in the 9th horizontal tile from the left behave differently than in other tiles in the grid. The grid tends to recur in multiples of nine in the grid, such as in the 129th horizontal tile, which exhibits similar properties.

The most common glitch is clipping through solid assets (like question blocks or walls) when bumped from underneath.
Ok, let's see what's in this question block, maybe it's a mushr... What the hell just happened? Did I just clip through the wall? Is this X=9?
X=9 by Abarbarea July 5, 2019
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