Your'e it! this took me ages to figure out. The fuzzy math wasn't adding up, but I finally carried the 1, and got everything in the right place and th right time.
Spoiler--The bottom boulder goes left then up.
Middle boulder, Push up then right, It will bump the first boulder to the right. Now push that far right boulder onto the purple button.
ow the far left boulder, Push down, Left, Up then right, As you push it right follow right on its heels, As soon as your even with the green gate run down through the green gate before it closes, You should be home free
now, i know i could never have done this without the spoiler, keeks...good golly miss molly...that was something else..thought it was one of marks levels for a minute..and you werent kidding when you said to stay on its heels..cause if ya didnt, you were toast...good one..
I may have figured it out without the spoiler, but I'm not betting the farm on it! And the amount of time I sat staring at this without any inspiration makes me very happy that you showed us the way!