Rainbow Islands/Islands 5 - 7

Island 5: Doh's Island
Reaching the fifth island is no small feat. However, as a reward, the game substitutes challenge for cameos. This is the first Taito theme island, and the theme is none other than Arkanoid. The island is named after the chief nemesis in Arkanoid II: Revenge of Doh, and all of the platforms are constructed out of Arkanoid bricks. All of the enemies are the shapes that appear throughout Arkanoid, and even the music and sound effects are replaced with the "ping" and "pong" noise created by the ball and paddle. Interestingly, the first round of the island, Round 17, is the longest of the four, and the third round (19) is one of the shortest rounds in the game.

Boss: Doh
Doh appears at the top of the screen and remains stationary throughout the entire fight. Every so often, he fires a stream of spinning squares in your direction, which you can attack with your rainbows if you're fast enough. There are no platforms in the room. If you have one particular powerup, the book that gives you wings, this fight can be incredibly easy. if you don't have it, this fight can be incredibly hard. If you have the wings, all you need to do is fly up to his height, and attack and crush him with rainbows. If you don't have the wings, you'll have to generate platforms for yourself out of rainbows, and then attack him while you're high enough. Eventually, the rainbows will disappear, or you may jump on them and knock them down, and you'll have to repeat the process. If at all possible, make sure you have wings before you reach Doh. One surefire way to do this is to find the silver door on the fourth island and collect the giant book which gives you the wings permanently.

Island 6: Robot Island
After passing through a theme island, you return to the rigorous and more demanding challenges that were present earlier. Robot Island may remind you quite a bit of Monster Island in that the enemies are fairly aggressive, and more determined to reach you. The quantity of enemies is a bit higher as well, as you'll rarely go far without seeing a couple appear. If you've managed to discover the giant special items behind the first four Silver Doors, you stand a very good chance against the tough opponents. Stick to the lessons you've learned in order to reach this stage in the game, and you should be able to survive.

Boss: Robot
The Robot boss is like a more difficult version of the helicopter boss. He will float back and forth at one particular height, and then he will adjust to a new height before resuming his pacing. As he walks back and forth, he shoots rockets from his hands, and on occasion, he will release a spread of fire. Try to jump up to his level and attack him with rainbows while he is moving away from you. If he is low on the screen, try to jump up to the platforms and attack him from above by crushing him with rainbows.