Hamusuta the Happy Hamster in Ball Hamusuta The Happy Hamster The Carefree and Playful Pet. Watch Hamusuta The Happy Hamster scurry across the floor inside his rolling exercise ball Hamusuta The Happy Hamster runs in a ball with realistic running action. Hamusuta The Happy Hamster is almost like a real hamster - runs in the ball and out of it. Works with 1 AAA battery (not included).