Walkthrough
After completing the Mareen Moon Stage, you will unlock Planet Caverna. Believe it or not, this level is basically a tower that is full of Mini Bosses that you must defeat. The Mini Bosses that you must defeat include Bonkers EX, Bugzzy EX, Chef Kawasaki EX, Mr. Frosty EX, and Vividria EX. Luckily, you will be able to challenge and defeat them in any order you would like. Of course, this stage also includes another Rainbow Puzzle Piece.
The level begins with Kirby fall into a deep pit. At the bottom, both Plugg and Sir Kibble will be waiting for him. From here, you will enter the main chamber of the tower. In the middle of the chamber is the level's exit, which just so happens to be blocked off by five gates on both sides. To open these gates, you will have to enter each round trip door on the side of this area, defeating all of the Mini Bosses within each and every door. Once you have finished defeating all the five Mini Bosses listed, the path to the stage's exit will be cleared.
Before leaving, don't forget to nab the Rainbow Puzzle Piece of this level. Off to the right of the main chamber, you will find a number of obstacles that Kirby must clear in order to reach the Rainbow Puzzle Piece. These challenges include: Burning Logs, a Post, Stone Blocks, and Canvases. By now, each of these should be a piece of cake to complete, so that Rainbow Puzzle Piece is as good as yours.
Copy Abilities
Artist, Cook, Cutter, Fighter, Hammer, Ice, Plasma, Suplex
Coner, Gabon, Kabu, Knuckle Joe, Noddy, Plugg, Scarfy, Sir Kibble, Waddle Dee
Bonkers EX, Bugzzy EX, Chef Kawasaki EX, Mr. Frosty EX, Vividria EX