Grass Land, Level 3

First, grab the Parasol ability, which you can find at the beginning of Level 1, or in Area 3. Just continue through the level until you come to the Rainbow Drop Room #1, then use the Parasol ability to break through the blocks.

Big Forest, Level 2

You just need Needle ability for this one. However, you'll have to play through the level once before you can come back and get it. Right after the first part of the level, you'll find Spikey in the next part. Take his power, then come back. At the very start of the level, drop down and you'll find a door that leads to Rainbow Drop Room #2. Use your Needle ability to break through the blocks.

Ripple Field, Level 3

Get Kine before anything else, then go on to the second part of the level. You should see some Elieels hanging out in their pipes. Go further to find Rocky hanging out. Grab the Stone ability from him, then go back to the drop between the Elieels. Use Kine to swim against the current to the enter the door. You'll find five stars. Get to the right of the room and keep jumping and pressing up to enter a secret door. Now use Kine and Stone to break the blocks in Rainbow Drop Room #3.

In the beginning of the level, beat Efrite and take his Burning Ability. You'll also need Kine once again. He might appear after you beat Efrite. When you reach the room after the scrolling part, find an area where there is three blocks covering a pit, and then 2 blocks on each side. Leave the two blocks on each side alone, without them you can't get back up. Use the Burning ability to get rid of the blocks in the middle. Then go down, until you find some star blocks. The only problem is, you can't burn them. So, the tricky part is to drop your ability, inhale a block and spit it out, THEN get your ability back before it is destroyed. Do this twice, so you and Kine can get though the hole. This is very hard. Now use Kine to drop and swim through the current to reach Rainbow Drop Room #4. Here just blast the blocks with your ability and Kine.

You'll need Rick for this level. You can get him in Iceberg, Level 4 really fast by beating Efrite again. Then at the start of Red Canyon, Level 5, get the Spark ability. Continue through the level until you come to the level that scrolls upwards. You'll then find a door, but keep going up where Spikeys are, to enter the top door. Here, use Rick and the Spark ability to create a beam to destroy the blocks. However, you will not be able to make the jump across the pit with Rick. You will have to discard him to grab the piece in Rainbow Drop Room #5

Cloudy Park, Level 2

First, get Kine again. As you go through the level, you'll get to a part where your lifted by air currents. When you get to the very top platform, drop down to find a door guarded by two Glunks. Then, swim to the left and beat Master Green, and obtain the Spark ability. Then swim to the right to fight Blocky. Don't take his ability, but take change your helper to Rick. Now, exit this area and continue right where you were with the air currents and make your way to the end of this area. You'll come to two Shotzo guarding another helper. Use Rick and Beam to knock out the blocks (and the Shotzos) freeing Coo. Take Coo. You'll come to an area where the winds are strong, use Coo to fly against them and get to the door at the very right. Enter to fight Waiyu and take his Cutter ability. Then fly to the left avoiding the Gordos, and enter the first door you see. This is Rainbow Drop Room #6. Use your ability to break the blocks and take the drop.

Dark Castle, Level 7

This is a small puzzle, in which you must use an ability to break through one of two blocks. Choose the right path to get the last drop.

First take Burning ability, then break through the blocks. Then Stone ability, then Needle, Ice and Cutter. This will lead you to Rainbow Drop Room #7.