Upon entering this level, smash through the roots, then whack the ghost that appears before you. Then slide down the vine which wraps around a tree stump with a clue bottle on it.
Once you reach the end of the vine, press on and break your way through another set of roots. Up ahead is a ghost generator. Smash it, and the ghosts will stop appearing. Collect the clues in that area, then swing across the swamp to the next pathway. Break through the roots near the signal repeater, then smash the safe for a couple more clues.
Up ahead is another clue with a mosquito guard flying around it. Then take out the swamp monster guard and grab the clue next to it. There is also a crocodile mouth ahead. Smash through the branches and collect the clue to your right.
After passing through the mouth, you will enter into a large room. On the floor below are three ghost generators. Quickly sabotage them all, then collect the clues on the bottom right corner. Then bounce up the trampoline, and head to the left to discover some more clues. Head back to the right, and sneak around the ledge, staying in between the moving lasers. Then climb up the rope to reach the platform with the siren. Smash it, then sneak across the roots, then hop onto a large hanging lamp to collect some more clues.
Jump onto the hanging ropes ahead to reach the next path. Take out the mosquito and collect the clue on the tree stump to your right. To the left in this area, walk along the branch to get on top of the crocodile structure. There are three clues in between the eyes. Cross back over to continue on.
Spire jump onto the flaming torches, then collect the clues sitting by the giant gravestone. Then hop across the small moss pads, dodging the ghosts. On the furthest pad at the right are three clues. Smash the ghost generator, then take out the three mosquitoes in that area. Smash a case to get more clues. There is another clue behind the tree next to the vine.
Slide on the vine over to another ghost generator and smash it. Collect the Lucky Charm, then grab the clue to the right, and then grab the one by the final vine. Take this vine to reach the final area where the treasure key is.
Slightly behind the key case is a clue and the rest are found in two cases behind the vault. Once you grab those, crack the vault by dialing in 1-2-8. After that, just head over to the key and steal it, and you can finally get out of this area.