Mt. Dedede

Mount Dedede, always spelled as Mt. Dedede, is a mountain in Dream Land. Not much is known about the mountain itself, other than the fact that Castle Dedede is at its top.

Kirby's Dream Land
Mt. Dedede first appears as the final stage of Kirby's Dream Land. Here, Kirby must fight the other bosses in any order, then fight King Dedede.

Kirby Super Star and Ultra
In Spring Breeze, the castle is shortende to only two rooms, one area where Kirby can choose an ability, and one with Dedede.

Later in Revenge of the King, Kirby must fight Kabula in the mountain's skies, then enter a large castle known only as "The Revenge". This castle is guarded by various enemies such as Spear Waddle Dees and Phan Phan.

In the Anime
Although not really a mountain, in the anime and Kirby: Squeak Squad, Castle Dedede is on the top of a grassy hill.