This and many other stupidly precise tricks, like pixel-perfect jumps against the sides of walls or a plethora of bugs involving Yoshi and his tongue.
The most common use of this particular bug is what’s shown in the image, carrying a shell and a key at the same time. You need to throw the shell against a wall while falling and land on it to extend your jump past what’s normally possible, while also carrying the key across the gap. It’s everywhere in Kaizo runs.
This and many other stupidly precise tricks, like pixel-perfect jumps against the sides of walls or a plethora of bugs involving Yoshi and his tongue.
The most common use of this particular bug is what’s shown in the image, carrying a shell and a key at the same time. You need to throw the shell against a wall while falling and land on it to extend your jump past what’s normally possible, while also carrying the key across the gap. It’s everywhere in Kaizo runs.