House Puzzle (Toy Room)

Hint 1 of 4:

It appears that not every starting configuration of this puzzle can be
solved -- namely, if you've managed to get a completed house except for one
square, you probably won't be able to finish.

Hint 2 of 4:

There is a very simple pattern that will help you solve those configurations
that can be solved.

Hint 3 of 4:

I found it easiest to work on the middle row first.  Use only the column
changing buttons (the top and bottom of the puzzle) to get the middle row to
look like what it's supposed to.