Hey, Just made an average lvl. Just made it to test the game a bit. Its called Martins world 1, so check it out :P
Anyways, when you're in the world, just follow the bricks til you see a red, poorly made house. Enter it, and you will see 4 things. 2 rooms, a fireplace and stairs to the roof and basement. The stairs up just brings you to the top of a small "tower," Nothing interesting there. Try to light the fireplace as well. I just thought that was a clever detail. In the first room, you will see something I tried to make look like a bath tub. Blue blocks for water will have to do the trick for now. Then, in the next room you will see have something I hope look like a bed. Then, down the basement. First, while still in the steps, find a way tp the left. Thats just some random burnables, but I thought it made the place less emty. Then, just a bitt further down, to the right, there is another way. (might be covered in wood, if so, just remove it) inside you will see some TNT. Light it, and most of the house will get blown away (dont do that yet) Then exit, and follow the red bricks to a pile of leaves. Light them, and then enter the house again and wait for a bit in the main room. When its over, exit and follow the black bricks til you see the red arrow. Go in that direction and enter the tunnel. Go to the end of it, and you will see a big tower. Enter it, and light the wood to the right. Once the gire stops there, the wood to the left will ignite. Go up the stairs and explore. The tower as a rooms with (something I hope look like) water, flowers, a bed, and even one with tons of TNT and one with weird paintings. You can also go to the roof and look down on my creation.
Also, when in the first building, feel free to go all the way down the basement, and explore. Its HUGE down there, and even I haven't found all the small caves there.