The Smash (Súper Smash in Spanish) ability is based off of his moves from the Super Smash Brothers series. The first Kirby game to have the moves is Kirby & the Amazing Mirror. It has moves from Hammer, Cutter, Stone, and Fighter. You get it by inhaling Master Hand. Also in the Super Smash Bros Series, Kirby uses this ability.
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Attack with... familiar fighting moves. Press B with the Control Pad for different smashing attacks.