Brief explanation of Rolling Mouse. ▼ Various hamster friends. Collect a total of 15 animals. House mouse, panda mouse, squirrel, roborovskii, golden hamster, mouse, dwarf hamster, guinea pig, hedgehog, gerbil, flying squirrel, rabbit, Rat, Chinchilla and Capybara friends will join you. The more the animals you collect, the more electricity you produce.