I love this game and to pass lvl 9 you put a blue portal at the top and yellow at the bottom, then when you start infinite falling, put a blue portal next to the yellow and you will fly upward, then just hold right. Then to pass the second ledge, put a yellow in the corner and a blue in the top of the white part on the side ledge, then jump in the yellow and hold right. The first time you pass through you will not make it, the second you will. I really hope this helps you. Still this is one of my most addicting games.