The Shack


Hint: The first box you'll need is the one out back.

Full Solution:

One way to solve this: First, go to the back and force the wood box into the shack area, being careful not to disrupt the existing box and boulder. Then weave it around to the upper right corner and down the ice chute into the water. Next you'll need the 2nd box, so push the boulder out of the way and quickly push the remaining box into the back area so you can get behind it, then push it into the shack area. Follow the remaining steps as the first box, and you'll be able to sail home.