Similarly to Kirby's Epic Yarn, Kirby can gain various forms throughout the game, such as a submarine, a rocket, and a tank. For every 100 stars Kirby collects, Kirby can perform a Star Dash which increases his size, allowing him to charge through normally-indestructible blocks. Making Kirby go through loops will speed him up, while touching him will put him into a spinning attack to use against enemies. Players use the Wii U GamePad to help Kirby, who is stuck in a ball form, move across the level by drawing rainbow colored lines on the touchscreen to guide him. Kirby and the Rainbow Curse carries on the style of gameplay from Canvas Curse, presenting the game with a unique modelling clay look. Kirby follows a line drawn on the Wii U GamePad and collects stars scattered around levels to activate the 'Star Dash' power-up.
A pre-release gameplay screenshot of Kirby and the Rainbow Curse.