While traveling through a Suction Pipe, Kirby passes through a machine that splits him into two bodies. These two Kirbys are then separated and must use teamwork to collect items and hit switches to open doors. They then reunite on a rising platform. Soarars, Bronto Burts, and Cannon Cottas ambush the Kirbys; the heroes can counterattack by Tap Dashing into each other, which causes them to bounce around at high speed. The Kirbys eventually merge back into one body before heading into Wonder Space.
- Kirby + Kirby and Deploy the Kirby Tank! are the only stages in Kirby and the Rainbow Curse in which Kirby can collect only four Treasure Chests.
- Kirby + Kirby marks the third time in which Kirby was split into more than one copy. The previous two times were in Kirby & The Amazing Mirror and Kirby Mass Attack. However, unlike those previous two occurrences, this splitting of Kirby only happens for one stage and is not treated as an integral part of the game's plot.