Players take on the role of CHIBI-ROBO, a 4-inch robot, in a house inhabited by 8-year-old Jenny Sanderson, her parents, and their dog. Your goal is to spread happiness, and, as you do, you earn cool new robotic items. At night, quirky toys come alive and need your help to solve problems within their toy world.
Because the player sees the world from the viewpoint of a tiny robot, it takes logic, creativity, and planning to move around. Players quickly learn to climb up electrical cords and hop on drawer knobs. While Chibi-Robo can earn happiness points by cleaning the house, the best way to earn them is to accomplish tasks such as crawling into the drain to retrieve Dad's wedding ring or finding a toy pirate's missing ship. Players must periodically fight Spydorz, spider-shaped robots that, when defeated, provide scrap metal to build Utilibots that in turn form ladders, bridges, and even warp drives to help Chibi-Robo get around the house more quickly.