Wanted to say I agree totally with your opinion of requiring cachers to solve a jigsaw puzzle just to find a cache — and these 520-piece monsters take hours (even more when they’re one color!!!). Also, I despise the fact that jigidi.com does not allow moving unsolved “groups” of individual pieces around the screen. Moving one piece at a time just to create a visual sorting pattern is a nightmare! Short of auto-solving, your technique has worked fine for me. I did have one problem with those tiles that were colored “blue” — just too dark to read the black row/column values. I changed the code to “dodgerblue” instead, and even though it’s close to the “lightblue” color, there’s still enough difference in hue to make it easy to distinguish between the two. Thanks for the code that makes this work.