After you beat Skatopia I went to this pro skater level and I have no idea..

Pro Skater Level:

To get from Space to Monkey Temple:
Jump up from a quarter pipe on the main floor up to the second level. Get off your board, turn around, and stay there. You should see 3 wires: one red, one blue, and one green. Jump up to each wire until you get to the highest wire, which should be green. Grind to the right of the wire and make sure you have enough speed.

Once you reach the end of the wire you should see a red button ton the wall, sticker slap that (press A). Once you sticker slap it, the button should turn green. Now, do the same thing going the other way. When you go the other way, about halfway through you'll reach a small room.

Ignore that room and find where the wire continues in one of the couple of wholes on the wall opposite of the quarterpipes. Once you reach the end of grinding that wire, you'll reach another red button to sticker slap. After you sticker slap, a small video will automatically show up showing the landing pad leaving to another world. When the video ends, go through that portal in the main floor. You've made it another world that cherishes a monkey god.

Unlock the Underground Pool in the Monkey Temple:
Go inside. Jump up to the second floor from a quarter pipe on the main floor. There is a local up there who says something about ropes that are bout ready to snap. Grind on a ledge that curves up on the second floor. When you grind on two ledges
that curve that have one rope going up from them, the ropes will break. Once you break both of them, a small video will automatically show up about the big monkey god's big heavy ball dropping to the ground and breaking the ground. The pool is now in this hole in the ground. Note: the 2 ledges that have ropes going up from them are on the second floor by the local that's up there. They have water inside them from what I remember.

To go from the Monkey Temple world to Hell:
When you talk to someone on the left side of the outside he'll say something about defacing the 5 monkey idols. One of them are right behind him on a quarter pipe. To deface it, graffiti tag it. Another monkey idol is on the right side of the outside also on a quarter pipe. Graffiti tag that.

The other 3 are inside. One is on the left side of the main floor on top of a quarter pipe and another is on the exact opposite side of that, still on the main floor. Now, jump up from a QP to the second floor. The last one is up there. Once you graffiti tag all of the monkey idols, on your screen it'll say BURN IN HELL and show where the portal is. Go through that to go to hell.

To get from Hell to the Back Room of hell where the prince of darkness is:
On the top floor (where you start), go to the side where there is some kind of fish skeleton and where a big devil statue is sticking out. There should be a small devil called an Imp there that tells you what to do. Talk to him and he'll say something about lip tricking on 2 broken ribs. The two broken ribs are on opposite sides of each other on the two quarter pipes beside the imp. See how the whole big skeleton that connects the two quarter pipes has two broken ribs? Lip trick on those so that they'll turn down. Once they're turned down, grind on them and then sticker slap the 2 stars. One you sticker slap them, they should be glowing yellow.

When both of them are glowing, go through the mouth of the big devil statue that's tounge is sticking out. Your now in the back room where there are 3 rails and you can dance with the devil.

You'll have to do all that every time you go to the Pro Skater Level if you want to unlock all of it, but it is pretty easy. If you go to the 2 Player thing, though, everything will already be unlocked for you.

Just do the missions that are appointed to you.