How to get those elusive Heart Stars in
Kirby's Dream Land 3
Here's my little spoiler sheet on how to find those stars.
Next you'll head back
down, and pass through the center of the tree to get the other two
shapes on the right. The blue rectangle you should see almost right
away, and the yellow circle you'll find if you continue all the way to
the bottom. Again, to get these shapes, you'll probably have to
dismount from your animal.
You'll find some nice hidden doors in the upcoming dark rooms, but the really important use of the lightbulb will come when you're in the vertical scrolling section. When you've reached the top, and the only way out appears to be through a door on the right side of the screen, flash the lightbulb. You'll see a hidden door on the right that's the one you should really take (you can go through it without the lightbulb, but finding an invisible doorway with only a few seconds to spare can be tough). You'll fight a big Gordo boss; beat it and take its needle ability. You'll need the ability to break through the "needle" blocks and rescue the frog.
The next section will have strong currents. Head as far down and to the left as possible. Swim Kine against the current to the door, where you'll get Pitch (the green bird). Now you just need to make it to the end of the level with Pitch (good luck).
When you come to the underwater section with three doors, take the one in the middle to see the diamond-shaped creature. Note the block formation. Go to the door to the right or left to enter the second room, where you'll destroy some blocks. Create an identical formation to the previous set of blocks. That's all.
BOTTOM LEFT: Coo (the owl) and Stone
BOTTOM RIGHT: Kine (the fish) and Parasol
TOP LEFT: Kine and Spark (the lightbulb trick again)
TOP MIDDLE: No powers needed
TOP RIGHT: powers will be
in the order: parasol, spark, spike, stone
MIDDLE RIGHT: exit
Hopefully, at this point you'll still have Coo and the fire ability. Go forward and start blasting through the ice. Enter the first door you encounter, it'll have flowers around it.
Go down through the crumbling blocks to ChuChu (the pink blob). Ignore the door behind her. Drop Coo and take ChuChu to break the ice above (hold down Y and B simultaneously). When you get to the top, drop ChuChu and go back for Coo. You'll need him to blast down through the next set of ice blocks. Ignore Pitch (the green bird) and the door behind him. Go back for ChuChu to break the last set of blocks. (Go up using Y and B again). Take Coo through the door at the end. When you enter the last vertical passage, the shell will be on the right.