From a start door, go toward the upper left.
Fall down to the bottom and go to the left.
On the left edge there is an appearing ladder.
Let's climb it.
After climbed, drop a wooden box placed on your way into a hole and then go to the right side.
Climb a ladder on the right side of a door.
When you get to the top, go up to the right brick stairs.
Then climb the right-side ladder on the end of bricks.
You can find a key at the top.
After got a key, go back the way you've come and climb a ladder placed on the left side of a door.
When you get to the top, go up to the right and climb again a ladder on the right edge.
After climbed, move toward the upper left.
You can reach a goal door beyond a ladder.