Kirby's Return to Dream Land Cheats

Hard version of Stage 5-5
Once you enter stage 5-5, float above the doorway and you'll see what looks like a window with three bars on it. Press up to enter it as you would a normal doorway and you'll go through a much harder version of the stage. The four sections are 1) Water Galborus, 2) King Doo followed by Dubior, 3) Kibble Blade & Gigant Edge, 4) Bonkers & Moundo. In addition to being against harder enemies, the fights take place in smaller than normal areas. You can get the four Energy Spheres and the path is available on EX mode.

Copy Ability Rooms
Collect the designated number of Energy Spheres to unlock Copy Ability Rooms for easy access to Kirby's powers.

Copy Ability Room 1: Collect 20 Energy Spheres.
Copy Ability Room 2: Collect 40 Energy Spheres.
Copy Ability Room 3: Collect 60 Energy Spheres.
Copy Ability Room 4: Collect 80 Energy Spheres.

New Sub-Games
Collect a certain amount of Energy Spheres to unlock two new sub-games. These can be accessed aboard the Lor Starcutter, down the ladder after the main lobby.

Ninja Dojo: Collect 15 Energy Spheres.
Scope Shot: Collect 30 Energy Spheres.