if your asking about the mission its either the hardest one or there's another track which is there only for the mission hope i helped :)
Ski hill
Sled racing
Go on top of Ski hill click the flier on the wooden pole and choose a sled.
In mission 2 you test drive gs sled and crash
There are 4. Ican name 2 for you: the Bunny Hill and Express.
the new pin is in the boxes of the lodge attic
There are four sled runs in Club Penguin: Bunny Hill (2 penguins can sled against one another), Express (2 penguins also), Penguin Run (3 penguins), and Ridge Run (4 penguins).
You can't rebuild the sled
What sled? if your talking about the one in one of the missions, i think you have to find G a few parts for it. But im not exactly sure.
you stop playing club penguin
No, Night of the Living Sled was the last one. Night of the Living Sled was released 2009. There was no change in the 2010 Halloween Party on Club Penguin.
Go to the ski hill (on map) and drag the sled to the 'test track' strate in front of you.