Follow the red carpet, then jump to the pillars to the right, collecting the crystals. Be careful though: these pillars begin to shrink as soon as you climb on them, until they disappear. Then cross them quickly, jumping. On the central pillar (which does not disappear) there is a Dark Dantini, take it out quickly. Then go left, jumping on the disappearing pillars. You will come to a balcony where another Dark Dantini is waiting. In the two chests you will find some crystals and an extra life. Then go back, jumping on the disappearing pillars and reach the door.
All you have to do in the next area is follow the path by jumping on the disappearing pillars and collecting the crystals, until you reach the door. Enter to face the boss.
The boss will float above a huge circular pit, holding three balloons. You will have to move along the edge of the pit. The boss will throw bombs at you which, when they land, will start walking towards you. There are three square spring platforms around the pit: you need to move around so that the bombs end up on these platforms before they explode. When this happens, the bombs will be catapulted towards the boss, causing one of his balloons to explode. When you have destroyed all the balloons, the boss will fall and you have won the fight.