Buzz Blob Cave - Stage 1
Start by having all three characters grab a bow and then pop all of their balloons, to open a path so they can all meet at the center of the room. Once that's done, totem and throw people up on the ledge to the right then pop the balloon to unlock the door. Step on the TriForce gateway to continue.
Buzz Blob Cave - Stage 2
Stack all three guys and run to the large clearing then step on the large block on the ground. This will trigger the appearance of two big waves of monster horde. The electrified enemies are especially dangerous so lay off on the sword and stick to the bow, until there are only a few blobs left then you can go ahead and melee the stragglers. The chest further up the area has 50 rupees.
Buzz Blob Cave - Stage 3
For this next bit, you'll have to stack all three of your people and use the rotating platforms to navigate the wide bottomless pit. You need to hit a total of three switches to open the wooden gate leading to the end of the stage. Some of the platforms have enemies waiting so it's a good idea to hit the switches with the bow from afar instead. The lone chest in the area contains more rupees.
Buzz Blob Cave - Stage 4
Now for the boss level, you will be fighting a Buzz Blob which can release a steady stream of electricity in multiple directions once it stops moving. So be ready to move away once you see it prepare to fire to avoid damage. The goal however is to hit the red orb kept under all the goo four times, so that you force the creature to change height. Simply stack your characters to keep up.