From a start door, fall down to the right.
Go up the upper right bricks by using a wooden box as a step and go forward to the right.
After you got to the right edge, fall down to the lower floor where a door is.
Then go to the left edge by either two routes: the lower one with dropping a wooden box into a hole or the upper one with getting liquor by using wooden boxes as a step.
When you get to the left edge, swallow a wooden box to get a key.
After you got a key, release a box to the place where the box was and step on it to go up the upper brick.
Go down to the bottom from the left-side edge and enter a goal door.