Superjump

A superjump is a type of glitch where upon certain conditions, a character will "superjump" to the top of the screen (they will simply go upwards in their current animation), above the upper blast line, although they will not be KO'd. If a solid platform gets in the way while the character is going upwards, they will float under it for several seconds. Notable superjumps include the Boomerang superjump, Super Death Jump and the Size change super Jump. Shield Jumping is also a type of this, however it does KO Jigglypuff.

Superjump physics

Most superjumps follow the same principle: If an action is interrupted between a large upwards force and a comparably large downwards force, the downwards force will not happen and the uninhibited upwards force will fling the character skywards. For example, if Kirby is using his up throw and the character he's grabbing vanishes after the upwards force but before the downwards force, Kirby will be sent very high.

A similar mechanic enabled double jump canceling.