Instant double jump

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An instant double jump, or IDJ for short, is the act of inputting a double jump immediately after a jump, ideally as low to the ground as possible.

Details

Pichu performing an instant double jump into a neutral aerial in Ultimate

An Instant Double Jump is a double jump performed immediately after inputting Jump. In most cases, this is done by buffering a double jump during a character's jumpsquat. If done correctly, the particles from the double jump should appear close to the ground.

Since the values that determine double jump height are different from regular jump height, the distance covered by an instant double jump is different from a short hop or full hop -- usually somewhere between the two.