-->First step on the false tile that is on the same line as the black TP now push the boulder on the far left up and quickly move to beneath the middle boulder, Now push the boulder to your right into the water go up and around and push both the remaining boulder into the water, Now go and get the metal box and push it into the TP and over to the cannon, wait until it is safe and push the box to the right to force the Z-Bot to the left and it will fly onto the barrel so that you can get the coin.
Thanks for the hint, Kiki! It solved my problem. I've played this one so many times that when I finally got that part taken care of I zipped home in record time. Thanks for the challenge and the help!