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Step 1
Work vertically, beginning with the vertical column on the left. This consists of the numbers 1, 5, 9 and 13. Move the 1 into position, followed by the 5.
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Step 2
Create a working area of five tiles in the six slots consisting of the three leftmost columns and the two bottom rows. Makes sure the 9 and the 13 are two of the five tiles. Put the 13 where the 9 should go and put the 9 next to the 13. Then get the lower-left corner open. Slip the 13 into place, followed by the 9.
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Step 3
Use the same approach on the next vertical column, which consists of the numbers 2, 6, 10 and 14. Put the 2 and the 6 in place, then create a working area of the bottom six slots. Put the 14 where the 10 should go, and put the 10 next to the 14. Clear the lower-left corner and slide the 14 into place. Then put the 10 in its place.
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Step 4
Get the 3 and the 4 into place by creating a working area with the two rightmost columns and the top three rows. Place the 4 where the 3 should go and then place the 3 directly below the 4. Then you can slide the 4 into place, followed by the 3.
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Step 5
Make another working area with the remaining six movable tiles to get the 7 and the 8 into place. Put the 8 where the 7 should go and put the 7 directly below the 8. Then, put the 8 into place and put the 7 in its place.
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Step 6
Finish the puzzle by putting the remaining 11, 12 and 15 tiles in their correct locations.
