Color Me Happy
From the Super Mario Wiki
Color Me Happy is a minigame in Wario: Master of Disguise. The game will show a partially colored-in image, and the player's objective will be to color the rest of the picture using the palette of the left. Before the player begins, they will be shown the fully-colored version of the player's picture before the uncolored parts return. The player must remember which sections were not colored before the preview, as those will be the same parts the player will need to fill in now. Tapping a color on the left, and rubbing the to color then in a certain location. This minigame is only played in green treasure chests and must be completed to get Guise Gems, Mastery Gems, and Vita Mighties.
"Study the colored image, then touch the screen to begin. Use the stylus to paint in the areas that are missing color. If you make a mistake, you'll lose a Wario hat. If you lose all your hats, you will fail."