Giant Kirby is fought on Stage 5 of Adventure Mode upon the Green Greens stage as an optional boss. If the player manages to defeat all of the Kirbys (including the first one who fights alone) in 31 seconds or less, a cinematic will play where Giant Kirby drops onto the second floating platform and lands crouching before standing up and smiling.
Giant Kirby is slightly larger than a regular Kirby with a Super Mushroom and is heavier and stronger than Kirby. If the player defeats Giant Kirby, they will receive the bonus Giant Kirby KO, which awards 10,000 extra points.
Kirby is one of the characters who may be encountered in a Giant Battle in Classic Mode.
In Super Smash Bros. for Nintendo 3DS, the opponents are fully randomized, but it is possible to battle against a giant version of Kirby.
In Super Smash Bros. for Wii U, Giant Kirby may appear as an intruder.