This can only be done AFTER you beat SSE.
There is a few things you need to do before getting 100% and finishing SSE. These are located in The Forest, The Swamp, and The Ruins levels.
You must WIN the fights against these characters. If you lose, the stage still ends and you have to go back through and fight them again. Also, you will fight time one-on-one in a one-stock battle with whatever character you enter the door with, not your party leader. You will be fully healed, however.
Level: The Forest
A few feet into the level, after the first battle, there should be a door in mid-air. Kind of hard to miss. Just to the left of the first Puppit that drops down. Enter, and you’ll have to fight Toon Link on his ship.
 Toon Link |
After the fight, you’ll clear the stage.
Level: The Swamp
Three doors in, and you have to fight Primid Diddy. Hop in the cart and continue right, past the fight with the Hammer Bros. Jump in the barrel and shoot to the next barrel. In here, you should see a door right in front of you. Aim for the next barrel above the Jyk, and have that barrel propel you to the platform. Enter the door to fight and unlock Jigglypuff.
 Jigglypuff |
After, the stage ends and Jigglypuff is unlocked.
Level: The Ruins
Get to the part where the platform moves down on its own and you have to dodge the crystals coming out of the wall. Part way down, two Metal Primid will fall on you. You have to kill both of them. A little more, and just before the secret door, another Metal Primid appears. You have to kill him as well, before entering the first door that appears on the left. Now you can grab the boxes or immediately exit.
You’ll fall a ways down. At the bottom, there should now be a door floating above the ground. Enter to fight Wolf.
 Wolf |
The stage ends, and Wolf is now unlocked.
