Spine Coaster

Bonecoasters are rideable creatures made of bone used to make Mario and his company pass through the lava pit. They only appear in World 8-7 from New Super Mario Bros. Wii, a stage that can be unlocked by finding the secret exit in World 8-2. It also appears in multiplayer versus mode.

Bonecoasters are very useful throughout World 8-7 because they will help Mario and his friends get the Star Coins in this stage and also prevent them from falling into the lava. However, the Bonecoasters make risky maneuvers, passing through lava geysers and into the lava itself. Bonecoasters can stand the weight of Mario, Luigi, and both Toads on it. However, if all characters perform a Ground Pound over it at the same time, it will fall making everyone fall into the lava. Also, Bonecoasters can not hurt any character.

Bonecoasters have been confirmed to return in New Super Mario Bros. Mii. One is seen in a dark cavern that's filled with poison water.

Trivia

 * "Bonecoaster" is a combination of the words "bone" and "roller-coaster".
 * The Bonecoaster somewhat resembles a Bone Dragon, but its head is smaller in size, and there are no spikes on its back.