2) Move boxes to those border positions can save space!
3) Push aside 1 box before you can clean the other.
4) Finish one again!
5) Now, get the third one!
6) You need to bush up one box in order to move box to the center yellow dot.
7) Now you need 'move' the left box down 1 step. Let's use the space above.
8) Just push the center box to left and push down one box. OK! Compare with figure 6, you move it down!
9) It's easy to finish the game here.
