The Green Rainbow Drop is located in Stage 2. Go to the bottom left of the first room in order to find a door. Inside is the Rainbow Drop. Needle is needed to break the Elemental Blocks. As Spikey, the enemy granting Needle, hasn't appeared yet, exit the room and go through the stage, where Spikeys can be found in the second room. Inhale one and finish the stage. Re-enter the stage and enter the door found at the bottom left of the first room. Use Needle with Coo to destroy the Elemental Blocks. The Green Rainbow Drop can be obtained without Coo.
Big Forest is the second level in Kirby's Dream Land 2. Unlike most of the other levels, it is not available or accessible in Kirby's Dream Land 3. The music theme itself for Big Forest was not reused anywhere else.
This stage is still relatively easy, but having Coo along gives you a definite advantage. Not only can you maneuver around obstacles, he makes it easier to find items hidden in the high branches of trees.”