It's pretty dark at the beginning of the stage, but if you have Pikarina investigate the pumpkin ahead, you find out you can use a bomb to light it up, after which it will roll down the hill. You can also use Pikarina to light the candles as you go down the hill yourself. You should see another large pumpkin with a star and moon for eyes; hit it with Pikarina to get the PUMPKIN HEAD.
Continuing on, the next pumpkin acts the same way as the first, only this one is spiked and will leave some in the ground, so jump over them when going down the hill. The next pumpkin will sprout vegetation, so use it to get to the area above, where you will find another pumpkin that does nothing. Of course, once you pass it, the pumpkin will roll after you down the hill, so move quickly to the bottom and go underneath it when it bounces. Investigate the large piece of cake to get the CAKE HEAD, then go through the portal.
In the next area, you will encounter some spirits, who will chase after you only to disappear when you get to light. Bomb the next pumpkin, then jump into its mouth and out the other side, taking out the Grubs. There will be more ghosts up ahead, so hurry and use Pikarina on the pumpkin past them, then use a bomb to light it up, making them disappear.
Use the candy on the vines to continue all the way to another dark pumpkin and more ghosts. Do the same as before, then defeat the Grubs inside the hollowed pumpkin, where you can use the Pumpkin Head action to get sent to a bonus stage. Go to the left and this pumpkin will require you to slam it after lighting it, then you can push it to the left to get rid of the ghosts. After the scarecrow is done talking, use Pikarina on him to get the GHOST HEAD (you can use its action right after, too).
For the next area where there aren't pumpkins, you need to go right when the fireflies light the candles, letting you slip by the ghosts (you can also use Pikarina to light them). After the second sprouting pumpkin, you can use the Cake Head's action to get a bunch of Moonsparkles. Go past the two swinging pumpkins, and to a giant one at the end, where you'll need to cut something loose to gain access to the boss fight.
BOSS: General Dog
While talking with General Dog, hit the three pieces of candy to net yourself the CANDY HEAD, then the fight will eventually start. His attack pattern starts with him smacking the ground with one paw, sending a "shockwave" of sorts that needs to be jumped, and then doing the same with the other paw. He'll then swipe across the screen with one paw, which you can block with the Knight's shield. If he hits you, he'll do the same with the other paw.
You DO need to block the swipe with the shield, after which he will try to bite you and then go back to the above pattern. Once you block the paws twice (it can be once each), two pumpkins will appear, so throw a bomb at one to make some candy appear. Cut your way to the top of the screen and release the bone, revealing Dog's weak spot that can be hit with a big slam. If you fall to the ground, use the other pumpkin to get back up.
After hitting him once, hit his brain with Pikarina to get the BRAIN HEAD. Dog will go through the same sequence of attacks again, this time adding an extra ground pound. Do the same thing with blocking the paws with your shield, then release the bone to expose his weak point. Do the Body Slam from high up to knock Dog unconscious, then initiate and finish the QTE to put an end to him.
