Walk along the tree trunk in front of you to overcome the lava pool. Jump on the crate that you will find on the other side, without breaking it. From there, you can jump onto the monkey bars on the left, where you will find the red crystal and the green crystal. Then stomp the three crates stacked on the other side, to find some clear crystals and the first Gobbo. Then go back clinging to the monkey bars and smash the box you left out earlier, to get more crystals. Grab the monkey bars again and reach the well on the other side. Stomp the lid and enter.
Here you will have to face a mini game. You will find yourself in a large cave with a single chest. Each time you try to get close to this crate, it will move. You will then have to hunt down the crate to be able to climb on it. When you are on it, the crate will no longer move and you are free to crush it. Inside, you will find the second Gobbo. Then go up to the platform to return to the open. Use the double arrow platform to reach the door and enter.
You will see a long line of rafts moving over a river of lava. You will have to go up this river using the rafts, jumping from one to the other. To the side of the rafts there are also two platforms with a crystal above. In reality, they are the blue crystal and the yellow crystal in camouflage, so don't forget to get them. Going up the lava river, you will find three chests: two of them contain crystals and the other the third Gobbo. Then enter the door.
Climb the climbing wall on the side of the door to reach the upper area. You will find a chest with the fourth Gobbo. Then jump on the suspended platforms to climb higher. Here is a chest containing the fifth Gobbo. Then use the jelly and the suspended platform to reach the highest point of this area. On a platform surrounded by lava you will find the pink crystal. Go back down and enter the crystal door.
This area seems deserted, but in reality you can enter the blue lake and access the first underwater area of the game. You will have to go through a long underwater tunnel, along which you will find many crystals and, at the bottom, the last Gobbo. There are no enemies here, so if you like, you can take advantage of this area to practice the controls in the water areas. Eventually, go back and enter the conduit to get out of the water. Hit the gong to complete the level.