Here's another new stage concept that I've thought up for Adventure mode...
Mt. Dedede / King Dedede's Castle
A platformer-styled stage, where the player infiltrates King Dedede's castle. Enemies that the player can encounter include Waddle Dee, Waddle Doo, Gordo, Poppy Bros. Jr., Blade Knight, Scarfy, Grizzo, Knuckle Joe, and Sir Kibble.
As the player advances, he/she will have to get through some maze-like passages, which are influenced by the difficulty route that the stage takes place in. Some of the rooms even require the player to defeat all the enemies before continuing.
Halfway through the stage is a mid-boss battle against Bonkers. He'll attack with his hammer and explosive coconuts, with the latter being reflectable. Bonkers will also spin around with his hammer extended, dealing a single strong hit on the player.
The difficulty route and set intensity will influence which Bonkers variant is fought; the variants include the standard Bonkers, Super Bonkers, Bonkers EX, and Super Bonkers EX.
Super Bonkers uses the exact same attacks as Bonkers, but they deal 1.2x Bonkers's attack damage. Bonkers EX adds some additional attacks, which includes his spin attack dealing multiple hits (instead of a single hit), throwing gigantic coconuts, and swinging his metallic hammer with greater force. Bonkers EX's base attack damage is 1.3x stronger than that of Bonkers. Super Bonkers EX uses the exact same attacks as Bonkers EX, but they deal 1.2x Bonkers EX's attack damage (1.56x).
Mid-Boss | Route | Intensity
Bonkers | All Routes | 0.0 - 2.9
Bonkers | Easy & Normal | 3.0 - 3.9
Super Bonkers | Hard | 3.0 - 3.9
Bonkers | Easy | 4.0 - 4.9
Super Bonkers | Normal | 4.0 - 4.9
Bonkers EX | Hard | 4.0 - 4.9
Super Bonkers | Easy | 5.0 - 5.9
Bonkers EX | Normal & Hard | 5.0 - 5.9
Bonkers EX | Easy & Normal | 6.0 - 6.9
Super Bonkers EX | Hard | 6.0 - 6.9
Bonkers EX | Easy | 7.0 - 7.9
Super Bonkers EX | Normal & Hard | 7.0 - 7.9
Super Bonkers EX | All Routes | 8.0 - 9.0
After defeating Bonkers, the player has to go through another maze-like area, with more enemy swarms to deal with. Some rooms may even offer special prizes, or a chance to heal.
At the end of the maze will be a long passage, which leads to King Dedede's battle arena. The player must face King Dedede in a 1-on-1 battle. Defeating him will complete the stage, unless the set intensity is 5.0 or higher, where another phase will take place.
When the player defeats King Dedede on intensity 5.0 or higher, he'll return onto the stage, and switch over to his Masked Dedede alter ego. In that scenario, the player has to defeat Masked Dedede to truly complete the stage.
Masked Dedede's attacks are 1.25x more damaging than that of King Dedede's, and he can still use items, and be affected by size-changing items. Also, most of his normal attacks receive a flame or electric effect, and some of his special attacks operate differently.
For his Gordo Throw, Masked Dedede will instead throw a Blado. The Blado itself is more damaging than the Gordo.
Masked Dedede gains super armor while using Jet Hammer, and it takes only 60 frames to reach full charge. When fully charged, Masked Dedede's Jet Hammer will cause him to spin around violently while keeping the super armor, and delivering multiple hits that end with a blow that deals strong knockback. However, Masked Dedede leaves himself fully vulnerable (even losing the super armor) for up to 360 frames once he stops spinning.
Masked Dedede would also serve as King Dedede's Final Smash, but the one encountered in this stage would not be impervious to knockback. On an additional note, Masked Dedede takes 0.8x knockback from attacks, despite being just as heavy as King Dedede, making him more difficult to KO.