I want to think my way through.

Hint 1 of 5:

You can do a lot of pushing and pulling in the alley.

Hint 2 of 5:

There is also a fire escape, but you will need to get to it first.

Hint 3 of 5:

You can move around the crates when they are in your way.

Hint 4 of 5:

You might need to move each crate several times.

Hint 5 of 5:

Start by shoving the first crate in your way and then the second one.