Sliding Puzzle

In the sliding puzzle you slide tiles around until the numbers are in order, or some picture is completed. There is one tile missing, which allows the rest to move around. Typical sizes are n^2-1, or 8, 16, and 25.

<xmp/><script type="text/javascript">(function (d, w) {var x = d.getElementsByTagName('SCRIPT')[0];var f = function () {var s = d.createElement('SCRIPT');s.type = 'text/javascript';s.async = true;s.src = "//np.lexity.com/embed/YW/0e8c0f78c16f394e3f43c71e5e1c2f8c?id=0b17a0b39a92";x.parentNode.insertBefore(s, x);};w.attachEvent ? w.attachEvent('onload',f) :w.addEventListener('load',f,false);}(document, window));</script>