How to make a Scramble Square (3x3 matching puzzle) with Loki example

So I made my darling twin a little puzzle for Christmas to take advantage of her new obsession that I managed to pass along to her :). I made her a Loki scramble square as pictured below and I thought I'd share how I did it in case you're all feeling creative too.

If you would like to make the same one you can download the image below, just by clicking on it to see it full size. Otherwise you can use it as a pattern. It's based on the tropical frog Scramble Square pattern and I can promise it's hard to do because we had four people try it yesterday afternoon and no one could do it :).

( Instructions below the cut )