Bone Bowser’s Fortress Battle Expansion Set (71423) lets you create a fantastic LEGO brick version of a legendary place from the Super Mario universe. Players can use an interactive figure (not included) LEGO Peach, LEGO Mario or LEGO Luigi explore the fortress. The fortress features an entrance in the shape of a hinged bowser mouth, a crane to free the purple toad from the trap and knock over bone bowser, pinball to defeat the bone piranha and bone gumba, as well as an embers sucker attack feature. A gym, secret door, secret strategy room, key block and treasure chest block are also available