The giant red Squirtle represents Boom Boom, a large Koopa miniboss. The stage and music track represent the fortress stages in Super Mario Bros. 3, which feature Boom Boom as a recurring mini-boss. Squirtle's shielding and crouching, in conjunction with the first battle condition, reference how Boom Boom retreats into his shell during his mini-boss battles, preventing him from taking damage.
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The boss of many of Bowser’s towers, fortresses, and airships across the Mushroom World, Boom Boom has been a foe of the Mario bros. ever since Super Mario Bros. 3. After each defeat, he’s granted magical abilities by Magikoopa: spin jumping, an increase in size, and even flight!
