In the Shell Pets game, there are identical containers. Each container holds an object but only one of them has a pet and it is shown at the start of each round. After the player sees where the pet is, containers close themselves and start to move and mix up on the screen. Players need to give attention to the container that holds the pet. When containers stop moving, the player needs to tap on the container that holds the pet to gain Pethereum Crystals. If the player fails to select a container that holds the pet, the game is over.