Bowser's Lava Lair

Bowser's Lava Lair is a galaxy appearing in Super Mario Galaxy 2, and is the final galaxy of World 2. As the name suggests, the galaxy is full of lava. There are also small square-shaped platforms on the lava that flip over, as well as various enemies, such as Whomps. Bowser is seen sitting on a throne there, which looks like a castle. To defeat Bowser and win the Grand Star, Mario must hit Bowser's arms three times when King Koopa tries to hit him.