Smash the two boxes in front of you to get some crystals. Ignore the well and climb the climbing wall on the right. Walk around the perimeter of this area to get lots of white crystals. Among them there is also the camouflaged red crystal. Be careful because in a corner there is also a Dark Dantini who will shoot you: when you get close, jump to dodge its attack and take it out quickly. Then break the lid of the well that is nearby and enter it.
In the center of this cave there is a well from which a pink snake jumps out, stay at a distance. On both the right and left there are two crates, one on the ground and one suspended. To reach the suspended one, you'll have to jump from the one on the floor, so wait to break it. On the suspended box on the right there is the yellow crystal, while on the one on the left you will find the pink crystal. Under the suspended crates there are two Red Dantini, take them out by crushing them while breaking the crate. From the chest on the floor to the left, you can also reach a platform suspended above a lava pool, on which you will find an extra life. The boxes all contain crystals, with the exception of the one just mentioned, which contains the first Gobbo. Then enter the door.
Cling to the balloon to go down to the lower level (note: if at the beginning of the level you had entered the lower well, you would have arrived directly here, without taking any items). You will notice a Gobbo prisoner in a cage that you cannot free for now. There are also two chests: one contains crystals and the other the second Gobbo. Then climb the platforms and kill the Red Dantini. Climb on one of the two crates to reach a suspended platform, on which there is a silver key. After grabbing it, break the two crates: in one there are crystals and in the other the green crystal. Go back and free the Gobbo in the cage. Finally, climb the platforms again and enter the door at the end.
There are two platforms suspended above lava pools, on the right and on the left. On the one on the right you will find the blue crystal and on the one on the left the fourth Gobbo. Then pass the lava pool further ahead using the rotating platforms. In the chest at the bottom, you will find the fifth Gobbo. At this point, you should have all the colored crystals, so ignore the gong and enter the crystal door on the left.
Jump on the jellies to reach a ledge above, which has some crystals on it. Then go up to the high pile of crates and destroy them all. You can destroy them all at once by holding 
. You will get many more crystals and the last Gobbo. Then hit the nearby gong to complete the level.