From WiKirby, your independent source of Kirby knowledge.
A Star Seal is a five-pointed star-shaped object which can be collected from large Treasure Chests in Kirby: Squeak Squad. There are five in total, with each bearing a different color. Collecting all five is necessary to enter the level Secret Sea, and from there, complete the game. Chests containing them glow in the star seal's color.
The star seals are found in the following locations:
Kirby: Squeak Squad manual bio
- "Collect five of these and clear Level 6 for a surprise"