Desert's walkthrough:
Quests[]
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Go to tile 
3 and pick up the pieces 
5 and 
6, then talk to the Water Seekers there. Now go to tile 5 or 6 (the Yellow Sand tiles), to the left edge of the tile. When you reached the left edge, place the other Yellow Sand tile to the left of your current tile, and keep going. Repeat this step 5 times and you will find pieces 
7 and 
8.
Just keep going with the Yellow Sand tiles, like this.
Go to tile 8, you will find:
- A safe, with some code with it ("90, -180, 270, -270, 90"): Rotate the tile 1 time to the right, 2 times to the left, 3 times to the right, 3 times to the left, 1 time to the right. The safe will be opened. You can pick up a Gold Coin from the chest.
- A sign buried in sand, that says "Follow the footprints in the yellow sands - make sure they connect!": Go to one of the Yellow Sand tiles (
5 and 6), you will see there is a footprints trail, follow the trail to the edge of the tile. When you are at the edge of the tile, place the other Yellow Sand tile next to your current tile so that the trails are connected. Follow the trail 3 times and you will find the piece 9.
The footprints in Yellow Sand. Place the Yellow Sand tiles to make sure they connect.
Go to tile 
9, pick up the piece 
10, and shakes the coconut tree 3 times to get the Coconut Shell. Talk to the Water Seekers, they will tell you about their missing captain, and hint to find her: Find the place that the plants thrive in the Yellow Sand. Go to the Yellow Sand tiles ( 5, 6 and 10), you will see that each tile has a corner with a bunch of cacti. Place the Yellow Sand tiles together so that the cacti corners touch each other. Tile 
11 will appear, and you can find a camel and a letter left by the Water Seekers' captain there.
The cacti in each Yellow Sand tile's corner.
The letter of the captain has a hint about her location: "I found some strange ruins, sister! I'll meet you in the middle of them.". Go to the Yellow Sand tiles ( 5, 6 and 10), you will see each of them has a row of rocks in one edge. Place the Yellow Sand tiles in a T shape so that the rock rows surround one "invisible" tile. Tile 
12 will appear, and you can find the Water Seekers' captain there.
Talking to the captain will get you the piece 
13. Go to tile 13, you will see a well. Interacting with it will say the well is missing a rope and a bucket to function. Go to tile 11 and take the Scarf from the Camel, and go back to the well. Give the Scarf and the Coconut Shell to the well, you will get a Coconut Shell filled with water. Give the Coconut Shell to the captain in tile 12. She will be revitalized and thank you for saving her.
The captain says that she lost an artifact, and you can help her finding it. To find it, go searching in the Yellow Sand tiles ( 5, 6 and 10) until you find a Sand Rogue, then a trap will spawn inside the Yellow Sand tiles. Put the Gold Coin on the trap, and hide. The Sand Rogue will be caught in the trap, dropping the artifact Ancient Lens. You can pick up the artifact, and check the Sand Rogue's body to find the piece 
14.
Give the artifact to the captain, she will attach it to the ancient ruins, and there will be a light beam from the ruins. First, arrange the pieces 
4, 5, 6, 7, 10, 11, 12 and 14 together so that they resemble a castle, then stand under the light and open the map. Tile 
15 will appear. Place 4 tiles 3, 8, 9 and 13 so that their dry lakebed sides are connected to tile 15. The oasis will appear. After that, you will spawn in the Oasis.
After you talk to the Water Seeker grandma, there will be an earthquake that create an underground part. You can go into that path to get out of the Desert, into the Chalet, ending Chapter 5.
Secret[]
In the Desert, you will find plenty of cactus plants. Interacting with them 5 times to get a puzzle piece of the Airship.
There are a lot of cacti, touch them several times.