Two players can play Spring Breeze simultaneously.
In Kirby Super Star, a second player can control a Helper via a second controller. In Kirby Super Star Ultra, a second player can now control a Helper after connecting with the first player via local wireless. There is a "2-P Spring Breeze" option available on the file select screen of Kirby Super Star Ultra, which allows the game to be played in two-player mode with only one player having a copy of the game. The player that does not have the game uses DS Download Play, and instead of having a separate screen, plays the game while watching the first player's screen.
Curiously, the crowd seems to cheer when Kirby lands a hit on Dedede, and not the other way around.
King Dedede's arena changes its appearance from Kirby Super Star to Kirby Super Star Ultra; in its first incarnation, it appears to be based off of a boxing arena. In the remake, however, the arena mimics its original design seen in Kirby's Dream Land.