Yummy Yummy Monster Tummy is a digital companion for the popular board game of the same name. It is a co-operative card game where players work together to feed the Creatures with the foods they like. The game is designed for 2-4 players and involves color matching.

Each level in Yummy Yummy Monster Tummy consists of several Creatures that players must feed. When a Creature opens its mouth, players choose an Item card from their hand and scan its QR code to feed it. The goal is to feed the Monster with Item cards that combine and mix into a color similar to its fur color. If the color combination is not similar to the Monster's fur color, the players lose the game and have to restart the level.

The game offers two modes of play: Story Mode and Party Mode. In Story Mode, players follow the story, unlock new Locations and Items, and encounter new Creatures with special abilities. Party Mode allows players to play a single game session using all the unlocked Items, without worrying about the story.

Yummy Yummy Monster Tummy can be played offline once the app and scenario are downloaded. The app also allows players to select their preferred language and saves their progress through the campaign, allowing them to resume gameplay at any time.