Kirby 64: The Crystal Shards/Aqua Star 4
As the name suggests, the stage takes place underwater. There are six sections, and being underwater will cause all of Kirby's movements to be slow.
Section 3 in the middle up against the roof, though there is a water current, so if you miss it you won't be able to swim towards it again. Use Rock Cutter combo to turn into Pitch to fly towards the middle of the roof to see the first Shard.
In section 4, after traversing some of the current you will see a pole. Travel down it to see the next Shard. You will also need the Rock-Cutter combo so the current doesn’t take you away.
The Blowfish is the Section 5 boss
In section 6, a current will, very quickly, pull you to the end of the stage. Use the Rock-Cutter combo to slow yourself down. Now head to the last bottom ditch. You will see the Shard. If you swim past the Shard, you must reset the level.
