Island 8: Magical Island
After having acquired all seven large diamonds, you are presented with the first of three new islands. Like the fifth island, all three of these islands are theme islands. This island is based upon The Fairyland Story, a game which was the spiritual precursor to Bubble Bobble. The game is represented by many of the enemies, as well as the background music. There's no sign of the main character Ptolemy, but every item, hidden or visible, is a 3000 point cake, reminiscent of Ptolemy's ability to transform enemies into cake. Despite the cosmetic changes, your strategy to complete this island should be no different than for the previous islands. Don't stop hunting for the seven small diamonds, as you need the mirrors found at the end of the next three islands in order to get the true good ending.
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The boss of this island is a large version of the demon that appears in Fairyland Story when you take too long to clear a screen. This version of the demon moves very much like the Helicopter boss of the second island, but faster. He horizontally from side to side, occasionally adjusting his height before resuming his movement. From time to time, he stops and throws his blue pitchfork across the screen. In order to fight him effectively, try lure him to the bottom so that you can get up above him, create some rainbows, and crush them on him before you get out of the way when he rises back up. Then repeat the process. It's important to give yourself enough time to move out of the demon's path; don't wait until the last second or you will have no room to get clear (unless you have the wings and can climb even higher than the platforms allow.)
Island 9: Darius Island
The second of the three final islands is an homage to Taito's horizontal shooter, Darius. The typical cartoon inspired enemies and backgrounds are replaced with slightly more realistic images found in Darius. Every round is full of enemies that have made the transfer from shooter to platform game. Surprisingly, the Darius Islands feature the most unique set of enemies that you have faced on a single island. The background music also comes from one of the stages in the Darius series.
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Boss: Electric Fan
The Electric Fan moves in a similar manner to the Dracula boss on Monster Island. It moves a short distance towards you, then stops to attack. When it attacks, it fires a few laser beams, as well as releasing for small ships. If the ships hit any of your rainbows, they mutually destruct. You can lure the Electric Fan to any portion of the screen and then attack from above. Just don't allow the boss to corner you, or you won't be able to safely escape.
Island 10: Bubble Island
This is it, the final island of the entire game. And it is an homage to none other than the precursor to Rainbow Islands itself: Bubble Bobble. For the next four rounds, you will be rising up through iterations of various Bubble Bobble themed stages, connected in one contiguous tower. Naturally, the music and enemies will change to that of Bubble Bobble. However, rather than having a peaceful state and an angry state, the enemies in Bubble Island are always angry. Bubbles rise from the bottom of the screen throughout each round. You can jump on them and ride them up to the top. Don't rest easy when you defeat the boss in Round 40. He will soon reveal his true form. Do you have what it takes to receive the true good ending? You'll have to make sure you don't miss out on collecting all seven small diamonds if you want to see it.
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This giant dinosaur in armor wanders back and forth across the screen at a particular height. Like Bub and Bob in their previous game, this dinosaur can spit bubbles from his mouth, and if this bubble happens to catch you, it's game over (if you're down to your last life). Avoid the bubbles at all costs by moving continuously. Get your attacks in whenever the opportunity presents itself. Once you reduce his health to zero, the fight is only getting started.
The true form of the boss is revealed, and it's a giant Skel, the white monster who would appear on the screen in Bubble Bobble when you took too long. Skel doesn't attack with bubbles, but he moves quite fast. He alternates between moving horizontally and vertically. Once you destroy him, a giant wand will fall from the sky. Don't take too long collecting it, because the pool of blood when "Hurry Up!!" appears is an instant game over. Assuming you also managed to collect all seven giant diamonds, and each of the three mirrors, you will be treated to the best ending in the game. Congratulations!