Lee Bee version:
On each island, all 7 diamonds have been collected, and in the correct rainbow order (from red to violet). This causes a special object appear on each boss screen, and collecting it gives you a permanent power-up for the rest of the game. It also makes a large diamond appear next to the corresponding island on the map screen. There are no more secrets to uncover in this home version, though the arcade game has three additional secret islands!

