Mutsu - Water Looper Mutsu (Japan) - Gameboy Advance - Simulation

Water Looper Mutsu is originally a japanese toy manufactured by Tomy, with a small aquatic creature made of plastic living in an aquarium. It is similar to a tamagochi, except that it's an actual plastic toy moving in actual water. The Game Boy Advance game however is a digital re-creation of this concept, making it actually closer to a tamagochi.