There is a bonus area at the beginning of this level, consult the relevant page. Jump from one islet to another using the rotating platforms and being careful not to fall. On each islet there is a suspended crate, inside which there are crystals. Below the crate there is a Red Dantini. You can hit it with your tail or crush it along with the crate. Then reach the door and enter.
You will enter a cave. Here too there are two suspended crates with a Red Dantini underneath, one on the right and one on the left. Break them, collecting the crystals. Then overcome the lava pool, taking advantage of the rotating platforms and the two precarious platforms. At the bottom you will find two more crates containing crystals. Then enter the door to face the boss.
You will find yourself in a huge ring. Flibby will approach you and try to punch you. Dodge it by moving away quickly. After throwing his punch, Flibby will pause for a moment to catch his breath. Quickly hit him with your tail to make him fall on his back. At this point, quickly jump onto his belly and stomp him (note: it is not enough to hit Flibby with the tail to injure him). Flibby will get up and this time, when you get close, he will attack you hitting the floor violently. Dodge it, then approach again, carefully. Flibby will attack you again with a single punch, then pausing to catch a breath. Hit him with the tail again to make him fall and stomp his belly again. The third time Flibby gets up, he will attack you in three ways before stopping to catch a breath: first by swirling his fists wildly, then by violently hitting the floor, and finally with a single punch. Dodge all three attacks and hit him again with your tail to make him fall. Stomp him once again on the belly to defeat him definitively.