When you get to the section where you have to jump across the broken bits of bridge, stop. Instead of jumping across, go around the pit and find a box. Jump onto the box, but do not stomp it. Instead, turn around to face the ledge on your left. Triple jump from the box onto the ledge. This way you will skip the entire cave section with the breaking platforms. However, if you are trying to get the Golden Gobbo, just go through the door. Jump on the platform and kill the Dantini. Then, go over to the area with the save gong. Hit it and stomp the boxes. Find the platform with the blue crystal. Throw the Gobbo at the platform. Once done, jump on the platform, kill the Dantini, and go through the door. You can now continue with the rest of the level.