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A Bone Thwomp is a species of Thwomp that acts as a bone in Bowser's body in Mario & Luigi: Bowser's Inside Story and its remake. They appear throughout the Pump Works. Bone Thwomps are more of an obstacle than an enemy, blocking Mario and Luigi's path. If Bowser drinks water, Bone Thwomps will float, allowing the bros. to progress through the game. They reappear later in the Airway, but they are shorter, and plumper. They are used as stepping stones to access higher ground.
|Thwomps and relatives|
|Akuiwagumi (leader) • Chō Dossun • Gattai monster • Head Thwomp • Mr. Thwomp • Mrs. Thwomp • Sphinx Zō • Thwomp Bros. • Thwomp Elevator|
|Big Thwomp • Bone Thwomp • Grindel • Omodon • Mega Thwomp • Pouncer • Security Thwomp • Sniffle Thwomp • Spiked Thwomp • Star Thwomp • Stone Elevator • Tail Thwomp • Thwimp • Thwomp|
|Big Whomp • Whimp • Whomp • Whomp King|
|Bomp • Flomp • Grrrol • Grumblump • Ka-thunk (King Ka-thunk) • Mega Grrrol • Rhomp • Spiky Tromp • Spindel • Spiny Tromp • Stairface Ogre • Stone-Eye • Thwack • Thwack Totem • Tox Box • Tsuboshi • Walking Block • Walleye • Wallop • Wonder Thwack|