slidings

The aim is to shuffle the tiles into numerical order and choosing between two strategies
( From “Left to Right” or from “Top to Bottom” ).
If you succeed the colored band will change from lightblue to softgreen.
Click on the 'Randomize' button and start sliding your game!

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 from Left to Right

1 5 9 13 2 6 10 14 3 7 11 15 4 8 12 from Top to Bottom

Solvability of the 15-puzzle

https://en.wikipedia.org/wiki/15_puzzle#Solvability

https://www.youtube.com/watch?v=YI1WqYKHi78