This level is especially hard because you need to have less than two moves per anchor that you need to clear. You need to connect squares, but you need to clear ALL of the clear dots underneath anchors whenever clearing squares. So, on the left, start at the top of the clear dots and go to the bottom and then loop back for the square. You can clear the board without any boosts if you keep the clear dots our from under the anchors and clear squares in the same moves.