sentences:  Later, when the detectives discover Jigsaw's new hideout, several officers walk up a caged staircase and are greeted by Billy, who wheels into sight at the top of the stairs on his tricycle and laughs.The cage then becomes electrified after one officer steps on a rigged step that breaks his legs.In a flashback in "Saw III", Jigsaw is seen constructing Billy for Amanda's game, painting the puppet's face.