Use the scissors to cut your way up the gas until you get to a spot with some Grubs. Take them out and you'll have to defeat two laser-shooting flowers by reflecting their beams back at them. There will be another vertical sequence here with more gas, then more Grubs and flowers. Hit the plane flying in the background with Pikarina to cause it to crash and get the FIGHTER PLANE HEAD. There will be two flowers at first, then three.
After this, use the gas to reach the next section, where there will be a bunch of Grubs and yet another flower. Cut through the leaves to the bouncing flowers and to a platform where you can use the Fighter Plane Head action to get to a bonus stage. Keep going to the top until you eventually reach Castle Wax Wane.
Inside, go to the right and be careful of the spiked vines. This place is pretty standard for platforming, so a step-by-step guide isn't really needed. You will find paintings here and you need to hit R2 on each one, with the corresponding to the Generals you fought throughout the game. When you get to a giant plant, throw a bomb inside and then cut the bud to destroy it.
After placing the Moonstone shard in the shape of a banana, you can use the Monkey Head action to do nothing really. When you see Gaff, hit him with R2 to get the GAFF HEAD, then keep continuing through the castle. The last animal painting is the dragon, after which will be a long painting with the Moon Goddess and her friends. If you hit all the other paintings, hit the long one to get the MOON GODDESS HEAD. Reflect the light with the Knight's shield onto the plant and do the seam cut sequence to get to the boss.
Vile Vines
At the beginning of this fight, find the light on the floor and use the Knight's shield to shine it on the nearest vine. Climb to the top using the leaves, then do a body slam to go below. Take out the beam flower and smash the floor on the left, where you'll find another two beam flowers. Remember to let your shield recharge before trying to reflect more beams. Cut through the vines and smash the next piece of floor, where you'll find more vines and a bud. Use the seam cut to get back to the top.
If you have the Moon Goddess Head, use its action to instantly defeat the big eyeball thing and read on below. Otherwise, reflect the light onto the eyeballs to get rid of them, noting that there will be a carousel of death in the middle. With the big thing gone, reflect the light onto one of the vine mouth things to continue the battle. It's best to isolate the flowers and only concentrate on one, so you don't get hit by the others. Use the leaves to get up and to the left, where you can pound the ground to go back under.
This is more of the same underground, so keep going until you enter the room with the bud. There will be four beam flowers here and it's important to remember that you won't be able to reflect the beam one shoots onto the same one at first, so reflect it at another. They go in clockwise order, so reflect it onto the next one. Cut the bud and use the seam cut to get back above, where you will find the big eyeball thing again.
Take it out like last time and there will be all kinds of vines, Grubs and some of the mouth thingies. Find the light you can reflect and then reflect it onto the mouth, enabling you to initiate a seam cut sequence. When you get to the top, you'll cut through the final bud and finish off the creature, getting the WHITE CASTLE HEAD in the process.
