So... the area looks something like this:
##vv##....##vv##
#....#....#....#
>....A....D....<
>....A....D....<
#....#....#....#
##BB##....##EE##
#....#....#....#
>....C....F....<
>....C....F....<
#....#....#....#
##^^##....##^^##
(# = wall, < ^ > v = lasers, A-F = crates, . = empty)
Now, the two pairs of crates in the middle (B,E) are much harder to get out than the others so you should use them to block lasers. You also have to push two crates inside initially to get in yourself, and those crates can't be gotten back out. If you pushed one of the A crates inside on the left side and one of the F crates inside on the right side, you'll end up getting out the following:
The other A crate, the other F crate, both C crates and both D crates.
Here's one final illustration of what the final situation might look like.
Click here to view the secret text
×
##vv##....##vv##
#....#....#....#
>.a..A....D.e..<
>....A....D..e.<
#....#....#....#
##BB##....##EE##
#....#....#....#
>.b..C....F....<
>..b.C....F..f.<
#....#....#....#
##^^##....##^^##
(small letter shows which crate went there)
As previously said, one A, one F, both Cs and both Ds will be going out.
1 crate used on the left ok, but i can't manage lucas to go down
Click here to view the secret text
×You need to use the crate first to manipulate the positions of all three balls. When it's correctly set up, you'll have a
.B.
B.B (B = ball)
formation where one ball pushes you ahead and two balls shield you from sides
.