From Kirbypedia

English Name:	"?"
Japanese Name:	かくし星 Kakushi Hoshi Hidden Star
Game(s):	Kirby Super Star -Milky Way Wishes
Boss:	None
Category	Star

"?" is a secret star in Kirby Super Star's Milky Way Wishes. It is a three-room secret level that is blended in the starry background of Popstar's nearby galaxy. It is noticeable by being a small green star, found in the middle of Cavios and Skyhigh.

"?" is the star's official name, as it is what is listed in the planet naming area of the game's HUD. It has two parts, the first room is a jungle similar to the first cave of the Great Cave Offensive. The second room is more peculiar, as it is completely in shadow. The sky is a dark blue, and the ground is completely black. Both rooms are rather short.

The third room is the star's exit, containing no floor, but only a warpstar to go back to the main map of the galaxy. Also in this room is a Deluxe Copy Ability Hat for the Copy Ability.

The only inhabitants of "?" are T.A.C. and Bombers.

Because it is not one of the seven neighboring stars with a Dream Fountain, visiting "?" is not mandatory for completing Milky Way Wishes. However, it must be visited at least once in order to get a 100% Game Completion Ratio.

The reason "?" is a secret stage is because it contains the Deluxe Copy Ability Hat for the Copy Ability. Milky Way Wishes' main intent is to disable Kirby's natural ways of copying and to make the player rely solely on no copy abilities at all, or ones you have found within a stage. The Copy Ability is a secondary form of Copying (mainly meant for the second player), and because of that, it defeats the purpose of Milky Way Wishes.

Without reading this article, the only way to find "?" would be by complete accident.

Locations (Game)

Stars: Pop Star - Floria - Aqualiss - Skyhigh - Hotbeat - Cavios - Mecheye Halfmoon - "?" - Rock Star - Aqua Star - Neo Star - Shiver Star Ripple Star - Dark Star

Countries: Dream Land - Mirror World

Other: Fountain of Dreams - Hyper Zone - NOVA