The game is a side-scrolling platformer where 3D characters are moved on a 2.5D plane. The player is also able to move and interact in a third dimension, with travel forwards and backwards enabled in sections of levels, and the ability to throw eggs at scenery and other elements of the foreground and background.[2] Outside of this new mechanic, the game plays similar to prior Yoshi games, where the player may use Yoshi's tongue to eat enemies or other objects, turn them into eggs, and throw them outwardly into the level. As in previous Yoshi games, flowers can be found in levels, which can be used to unlock paths on the world map.
In addition to the frontside, each level also has a backside, which can be played after completion. Players must find up to three Poochy Pups there and bring them to the finish line, for which they receive one flower per returned Poochy Pup. If they succeed in doing so within the given time period, they receive another flower. Each level has a variety of collectibles to obtain, each requiring different conditions to find. In addition to the Smiley Flowers strewn about each level, obtaining all of the collectibles of another type will give the player another Smiley Flower. Players do not need to collect all the collectibles in one run; previously obtained Smiley Flowers and Red Coins will remain translucent upon replays. Some collectibles are found in presents in the background.
Smiley Flowers are used to unlock new subworlds by paying a "toll" to the Blockafeller resting in front of it. Once all of them are collected, they can be paid to the big Blockafeller in Hidden Hills to unlock the Sundream Stone costume. Getting all the Smiley Flowers in a subworld will adorn the diorama with festive pinwheel flowers.
Blockafellers appear in each subworld to provide the Yoshis with missions to find souvenirs in the form of crafts, themed decorations that appear in the foreground or background. One at a time, Yoshi will be requested to find a certain number of the souvenir in a certain level. Once Yoshi finds and throws eggs at each of them, he can leave the level immediately, or continue to play through. Either way, after returning to the world map, the Blockafeller will give Yoshi a Smiley Flower as a reward and, if there are still uncollected souvenirs in the subworld, request another type of souvenir.
Similarly, a small Blockafeller named Sprout can be found hiding in every level, on the ground, once Baby Bowser is defeated. Although he does not give Smiley Flowers for being found, finding him in every level will award a costume based on himself.
The game features a two-player multiplayer mode, where each player maneuvers their own Yoshi through the game's levels.[3][4]