Walkthrough
By activating the Hidden Switch in the Western Outer Wall, you will unlock the extra level of Sector B. Like Sector A, you will have to face another Boss in this stage, a Mini Boss to be exact. This is also the first level where Kirby and Friends will perform the Friend Train. Besides that, this level is basically only good for this Rainbow Puzzle Piece it holds.
The level begins with a set of elevators that will lead you downward and to the right. You will quickly find the Friend Platform by doing this, allowing for Kirby and others to form the Friend Train in order to bust through the walls ahead. The Friend Train will even lead you to the next area, which will take Kirby down different paths and even up walls and ceilings. By making all the jumps at The End of the Friend Train, you will go down the path that leads straight to the Rainbow Puzzle Piece.
Near The End of the level, you will face the next Mini Boss, Chef Kawasaki. You might remember this guy from not long ago, as you've already had to battle him a couple of times. Defeat him like all the times before, and then head straight to the end of the stage and proceeding further.
Copy Abilities
Cleaning, Cook, Cutter, Fighter, Parasol, Plasma, Sleep, Staff, Stone, Sword
Blade Knight, Broom Hatter, Cappy, Coner, Grizzo, Jammerjab, Jammerjab Followers, Kabu, Knuckle Joe, Noddy, Parasol, Plugg, Propeller, Rocky, Shotzo, Sir Kibble
Chef Kawasaki