i beat all the missions on Club Penguin i will give it to you later but i will answer it.
you have too beat up and blow up the bear and crab
Eat it
the crab is at the fishing hole behind the lodge.
In the mission when the crab escapes, just go to ski hill and continue the mission there.
you'll find out at the end.
It's too hard to explain in my answer, so just search for it on YouTube. There are tons of mission guides on YouTube.
daa find herbert andthen you find the crab
you pull the lever!
on a psa mission 'clockwork repairs'
go on a new tab (if you know how to do it), then go on youtube, type in club penguin mission 6 walkthrough, click on the first one then follow what is does
the crab goes to the place where you crashed in g's mission and there you meet herbert the polar bear
On Mission 6, the black puffle releases you from the cage. You don't need a key.