Walkthrough
After completing the Planet Caverna Stage, you will unlock Grott Moon. Like most levels in this world, this stage is on the smaller side in terms of content. Really, all you must do is find its Rainbow Puzzle Piece and fight the next Boss. That's about it.
The level begins in a cave, where Kirby can recruit some allies and then activate the Friend Star. After doing so, you will need to cut a chain platform to find the way moving forward. The Friend Star will eventually fly into an open area, one where you can obtain the very rare Invincible Candy Item again. After this, you will come to a room with hanging bombs that you must cut down. Here, a breakable part of the wall will reveal a chamber. Inside said place will be a Bomb, and, if lit, will explode and reveal the Rainbow Puzzle Piece. Like the remaining Bomb fuses to proceed to the final area.
When you reach the final part of this level, you will face off against the next Boss. This time, that would against Grand Mam, a character you have yet to face to this point. Even though her armor makes basically all attacks from the Friend Star useless, her Bomb gauntlets can actually be cut off when she tries to attack Kirby with them. After they have been, the fuse can be lit to entirely knock her armor off, leaving her completely vulnerable to your Friend Star Attacks. This level is complete once Grand Mam goes down.
Copy Abilities
Cutter, Fire, Ice, Ninja, Sword
Bio Spark, Blade Knight, Bronto Burt, Burning Leo, Chilly, Puppet Dee, Scarfy, Sir Kibble