Jump on the rotating platforms to reach the upper level. You can't open the cage right now, so just ignore it. Along the perimeter of this area you will find two suspended crates, with an Ice Dantini underneath. Eliminate the enemy and stomp them. In one of them you will find crystals and in the other the red crystal. There is also a chest on the ground, containing the first Gobbo. After taking everything, enter the door.
There is a bonus area nearby, to access it, consult the relevant page. Jump onto the brown spinning gear in front of you to reach a slab of ice with a silver key on it. Take it and go back to the previous area, through the door. With the key you can now open the cage. Press the button to bring up platforms that will allow you to reach some crystals (among them there is also the camouflaged green crystal) and the second Gobbo. Then return to the next area. This time, use the rotating gear to reach the ice sheet on the left. You will find some crystals, including the blue one. Climb on the next gear and reach the ice sheet with a chest on it. Inside you will find crystals. Then go to where a single crystal is. From here you can jump onto the rotating platforms and continue on. You will reach two other chests; in the first you will find crystals and in the second the third Gobbo. Then grab the balloon to lead you to the door and enter.
Climb the platforms to go up to the upper level. Stomp the two crates to get more crystals and the fourth Gobbo. Then climb onto the rotating gear in the center of this area. You can collect more crystals and, on a platform in the middle, the yellow crystal. Then enter the next door.
Climb on the crate on the left without breaking it and from there jump onto the monkey bars. You will find a chest containing the pink crystal. Go back and stomp the chest to get more crystals. Cling to the monkey bars and follow them, collecting the crystals. Drop onto the islet and use the rotating platform to reach two other crates. One contains crystals and the other the fifth Gobbo. Go back to the islet and use the collapsing platform to reach the crystal door. Enter it.
Here you will have to face a mini game. Crystals will fall from above, above the pool of icy water. You will have to collect them using the cauldron. Crystals can fall in the middle, to the right or to the left. The two yellow buttons on the edge of the pool will move the cauldron to the right or left. You will have to act on them with timing and precision, to collect everything. In fact, at the first mistake, the mini game will end. You will need to collect a total of 30 items. Exactly in the middle of the game, you will have to collect an extra life, while the last item that will fall will be the sixth Gobbo. After getting it, hit the gong to complete the level.