what to do after going through all the levels of the mine

[DVD screenfinger]

I just reached level 120 in the mines and got the skul key, what should I do with it?

[jairgraham]

Use it once you find where it goes.

Just keep going with the plot, its easy to find once you get there.

And now you can enjoy going to any level of the mine and being able to specifically search for whatever metal you need. Though TBQH floor 40 is really good to go to both because Iron is in high demand and the fuzballs drop coal, which is in even higher demand.

[Nefai]

I'll frame my answer in the form of Violent Femmes lyrics:

Looks like somebody
Forgot about us
Standing on the corner
Waiting for a bus.

Say, hey mister drive Pam
Don't be slow
Cuz I got somewhere
I gotta go.

Say, hey mister driver Pam
Drive that thing fast
My precious time
Keeps slipping past.

[jairgraham]

Very nice.

Though TBQH it reminds me that it's very unsettling to me that time doesn't pass on the bus.

[I Kinda Fail]

It unlocks two things.

The first is in town: at the Saloon
the second is in the desert

[Silky Rough]

Originally posted by Neffzwei:

I'll frame my answer in the form of Violent Femmes lyrics:

Thought I'd chime in with some nonsense prose too...

The bus, the bus has deserted me
Cactus, coconut and Sandy see
But cost the gold high I decree
When you cave in to the mining spree.

Unfathomed depths, levels abound
A thrashing you'll get and roundly sound
Of plunder, loot and no monsters dull
The key I say is in your skull.

Tread north, go left, calciferous face
But waste not much your lively pace
Holes and rocks and cluttered space
Treasure, oh treasure, all over the place.

Eyes fast and clear and see aware
(And make sure you take in lots of stairs)
Time and energy will both fast wear
Or hospital bills are all you'll bear.

Iridium, gold and iron too
Copper and geodes, just 1 or 2
Rocks and stones your pick must chew
Explosives even, some daring-do.

Watch the clock, keep vitamins high
Fast key when low, the end is nigh
Don't miss key or click, you'll die
And learn, plan early, to bid goodbye.

[Pristine1281]

Yeah, once you get to the location of wheren you use the key is, be careful because it has tougher foes than the mines. It also helps unlock another task too.