World 2 - Level 9
For the first part of the level, carefully move the boxes to build bridges, avoiding the rolling boulders along the way. The real challenge, however, occurs close the end of the level.
To open the purple gate, enter the top room, but do not collect the bonus coins yet. Move the right boulder along the yellow arrow, then the left boulder around the level along the the white and green path. Now mve the other boulder along the blue path. Repeat this pattern until a boulder is above the exit path, and can be pushed along the purple arrow onto the purple gate button.