From a start door, move clockwise as following the route by bricks; head for a door.
Be careful that appearing wooden boxes fall down on your way.
When you got to the bottom where a door is, go to the right edge and climb a ladder.
After climbed, make a step with a wooden box and go up to the upper left bricks.
Climb a cracked ladder and then there is a key on your right.
The iron box under a key is breakable, so break it to get a key.
After got a key, go back your way as long as a shop door.
There is three iron boxes on your left.
Arrange a wooden box to the front of the iron box wall to climb.
Two ladders are lined up above the wall and climb just the lower one.
When you go to the right after climbed, you'll see another ladder on your right.
Climb it and go to the left.
There are two piled cracked wooden boxes.
Remove them and fall down into the left-side long hole to the bottom.
Then you will get to a goal door.