5x5

During a discussion over on Debate Unlimited I was reminded of a little puzzle I used to use as a test problem when getting to know a new development tool or environment. The puzzle is called 5x5.

Many years ago I wrote a version in Clipper (often including it in systems as an easter egg). I also seem to recall writing a version the first (and last) time I had a play with Visual Basic. I've also done versions for the Palm Pilot and for GNU emacs.

Prompted by this, and as a little lunchtime break, I quickly knocked up a web-based version. So, here it is, 5x5 in XHTML and JavaScript. You'll find details on how to play it on that page.