Walkthrough
After completing the level of Gatehouse Road, you will proceed with Kirby to the Eastern Wall. This is the first level that will see Kirby and his allies within the fortress known as Jambastion, as well as the first stage that introduces both the Jammerjab Enemy and the Staff Copy Ability. Eastern Wall also includes another Hidden Switch, as well as yet another Mini Boss Battle.
Roughly midway through the Eastern Wall, you will battle the next Mini Boss: Bugzzy. Like the previous times you have faced this Mini Boss, normal attacks should be enough to quickly take him down. In the area directly after where this battle takes place, there will be a platform that will lead you upward. Use Bugzzy's Friend Ability to break the rocks you come to, allowing you access to the door behind them. Once inside, use both Bugzzy's Friend Ability and Kirby's Plasma Ability to reach the Rainbow Puzzle Piece.
Near The End of the level, you will be able to find yet another Hidden Switch. In order to find it, you will need to lead one of the Wonkey that holds a key to a locked door below you. To do this, you will need to make a Friend Bridge and make sure he doesn't fall before reaching the door. The Hidden Switch, the same that unlocks the extra level of Sector A, can be found inside said door.
Copy Abilities
Beam, Beetle, Fighter, Plasma, Staff, Suplex, Whip, Yo-Yo
Beetley, Gim, Gordo, Jammerjab, Jammerjab Followers, Knuckle Joe, Two Face, Plugg, Waddle Doo, Water Bubble, Wester, Wonkey
Bugzzy