It seems that Gumball, Darwin, and Anais’s parents left out in the city for a while, and for them, it’s already the apocalypse, as they think they will be left alone and have to survive, which is the story of this game. Help Gumball and Darwin survive being home alone! Walk around with Gumball and rattle things to find items out of them, such as the bushes, the totem, the rug, and any other things around the house. Use said items to build a tent, a medicine room, an arcade game, a fire, and other necessary things! Make sure to take care of both your lives and your food rations, because if you were to lose them all, you also lose the game.

The player controls Gumball attempting to survive while Nicole and Richard are out. At the bottom of the screen are Gumball's health (represented by hearts), hunger (represented by bags of chips) and his boredom meter. Gumball will lose health if he is attacked, and if he runs out he will die. Hunger drains over time and can be restored by eating food. Boredom also lowers over time and can be restored through various means of entertainment, such as breaking things. Gumball can use button to break objects and collect resources from them, such as bushes, totems, vases and other objects from around the house, and eat button to eat food from his inventory. Gumball only has 5 slots, which can carry up to 10 of a specific material each. If Gumball's inventory is full, he cannot pick anything else up. He can drop items by clicking on them.

Gumball starts outside where he must build a camp to survive. Gumball gathers materials from inside and outside the house. Anais will also give Gumball materials, but provoking her will make her attack Gumball. Darwin is also a major hazard. Darwin will appear in random rooms and attempt to shoot Gumball with darts. If Gumball is hit, everything will go dark. Once Gumball wakes up, he finds most of supplies are gone and he has taken damage. The only way to avoid Darwin is to run away to another room.