Instructions
Shift all four boxes so that they are adjacent diagonally. To move each box, tap the square you want the forklift to move. The edges of the boxes should form a square, and the middle should be a blank spot.
Move down to the bottom and push the bottom box into the third darkened spot on the right. Push the box up one, putting it in the second darkened spot.
Return to the boxes. Push the topmost box into the topmost darkened spot.
Return to the boxes and push the right box into the fourth darkened spot.
Return to the final box. Push it into the last remaining darkened spot, automatically ending the puzzle.