The Legend of Zelda: Oracle of Seasons/Spool Swamp
With Snake's Remain's completed, you now have the Power Bracelet. With it, you'll be able to pick up the heavy rocks and Stone Mushrooms in Holodrum you'll find.
 Heart Piece in the Woods
Remember the Heart Piece that was blocked off in the Woods of Winter? Make the season winter and re-enter the woods. This time, you can lift the rock out of the way with the Power Bracelet and get your next Piece of Heart.
 Snowdrift Heart Piece
If you got the Piece of Heart in the Woods of Winter, you'll be ready to get another one. Head back to where you entered the woods through Horon Village while it's still winter. Go straight to the east, and then up north past the stump. Up here is are two ledges, and a snowdrift has piled up to form a bridge between them. Cross it, and you'll discover a cave on the left ledge. The cave holds another Piece of Heart.
With these two Heart Pieces, you're now ready to return to Horon Village.
 Farore, Oracle of Secrets
If you pay a visit to the Maku Tree, you'll notice he's grown a little bit from the essences you've recovered. Not just that, but an entrance has appeared. If you go inside, you'll meet Farore, Oracle of Secrets. She is able to decode secrets, allowing you to obtain new powers. Her Book of Secrets will list the ones you've learned, and the ones you have yet to find.
 To the Plains!
Head north of Horon Village to the path to Gnarled Root Dungeon. Use the Power Bracelet on the rocks to head north in to Holodrum Plain, but before you do, you can catch up on your trade quest.
 Trade Quest
 The Lon Lon Egg
Head north of Horon Village to the path to Gnarled Root Dungeon. However, you'll want to go east before heading further north. The path will take you to Talon and Malon's house.
Malon is a bit preoccupied caring for the Cuccos while her dad is away at Mt. Cucco. She's having a lot of trouble figuring out what to do. Fortunately, your Cuccodex is full of all the information she needs. She gives you a Lon Lon Egg in return. Wait a minute... didn't Maple mention she needed a Lon Lon Egg?
 The Ghastly Doll
Now, you'll need to make Maple appear. Defeat the required number of enemies and go to a place where she'll appear. When you bump into her, she'll want your Lon Lon Egg. If you give it to her, she'll give you a Ghastly Doll, which is very frightening to some people.
Now, it's time to head into Holodrum Plain and explore.
 Holodrum Plain
Head north just a little ways until the path branches off to the west. From there, just follow the path. When it leads to a second path that branches north, go there.
 Ricky, the Boxing Kangaroo
You'll find a kangaroo is up here. His name is Ricky, but he's upset about losing his gloves in a boxing match to a guy named Blaino, his rival.
Blaino doesn't live that far away. Go back east and take the path north. However, you'll run into a new type of Mystical Seed first.
 The Scent Seed Tree
Go one screen east, then one screen south from here and you'll find Blaino's Gym. Be careful, because a Spiny Beetle dwells nearby.
 Blaino's Gym
Inside the gym is Blaino, a legendary boxer. He's willing to face you in a boxing match if you bet 10 Rupees. It's a boxing match where you face off against Blaino until somebody gets knocked out of the ring. However, Blaino wants a fair match and doesn't want you cheating with any items or rings. Make sure you don't break his rules or he'll charge 20 Rupees for the next match.
 Ricky's Flute
 No Flute
However, if you don't want Ricky as your companion, buy a Strange Flute from Horon Shop (if you want Moosh) or win one at the Subrosian Dance Hall (if you want Dimitri).
Now that Ricky has his gloves back, he's willing to take you to his backyard, Spool Swamp, allowing you to hop in his pouch. You'll now be able to control Ricky, and get a few special powers from the kangaroo.
Ricky then tells you how to control him. You can move him with just as you would with Link. Press to punch or save power. Doing this will allow Ricky to shoot a tornado. He can also jump small gaps. Press to dismount him.
 Secret Sage
Before you head off to Spool Swamp, there is a sage you can reach if you have Ricky's Flute. Call him after going back across the bridge and narrow pass and down 1 screen, or he won't come. You can take Ricky up to a jumpable ledge, but beware the River Zora. Dismount and Use an Ember Seed on the right tree to find a sage who'll give you a super payday: 200 Rupees!
 To Spool Swamp!
The path to Spool Swamp begins south of where you met Ricky, but it's blocked holes. Fortunately, Ricky can jump right over them.
Head further south and you'll run into Blue Octoroks and Buzz Blobs. Ricky can take these out with a single punch. There are a few small trees close by, but one only hides a sage who'll take your money to fix his door... 100 Rupees worth!
 The Iron Pot
Go west, and you'll find Mrs. Ruul's House. Mrs. Ruul, wife of Mayor Ruul has a problem she needs help with. It's too hot, and she needs something to cool down with. One glance at the Ghastly Doll gives her shivers. As a reward for helping her, she exchanges the doll with an Iron Pot.