The ninth stage is with six boxes. Unlike the eight stage,
on this stage are three different types of boxes. There are four ice boxes, one normal box and one inert box, which can be used or left untouched.
Step by step solution
From the start position - go RIGHT, then push UP the first box. It will stop at the grass.
Go RIGHT, RIGHT, UP and push LEFT.
Go DOWN, DOWN, RIGHT, RIGHT, RIGHT, UP, UP, UP, LEFT and push UP.
Go DOWN, RIGHT, DOWN and push LEFT and LEFT.
Go DOWN and LEFT, then push UP and UP.
Only one box to place. Go DOWN, RIGHT, RIGHT, UP and push LEFT.
Congratulations. You have completed the ninth World. Get ready for the tenth.