Spiral staircase

It looks very nice, and it doesn't take a lot of effort. It's enough just to know a couple of tricks 🙂
Step 1: First, lay out the spiral staircase. For example, the max step length is 3 platforms.

Step 2: The funnest part. You will need a Ruler to make it easier:

1) You need to put wooden walls behind the platform 
2) To do this, click on the square with the platform on it

Step 3: Tile the rest of the area with walls of your choice.

Step 4: One last thing - remove the platforms like in this yellow square. This will make it look like the back of a ladder.

(I hope Hamrex doesn't bother anyone :))

If it is not very convenient to climb it, you can use it as a decoration =)
Personally, I ended up with this: