Quote Originally Posted by DataNinja View Post
There's one treasure I have no idea how you would get without Co-Op, and I never learned. My brother and I just did it all together.
Spoiler: How to get it
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I imagine you're thinking of the one in the optional castle area. You need to simultaneously have hammer/stone to pound a stake, and sword/cutter/wing/ninja to cut a rope. And said powers are not nearby.

If single player, you need to have one power as a computer helper, and have it survive as you make your way over, while Kirby has the other power. Can be tricky if the AI is being particularly stupid.

Although, I believe you could "cheat" by just using Plasma. Its shots go through walls, and can break bomb blocks. Plasma is such an OP power in this game, if you are at all decent at quickly rotating the control pad.