Well it has really been a while since I last visited this forum. I have mostly changed my interests from physics to computer science in this time. One of the things I've been working on is a simple open source puzzle game. It might be more appropriate for the Brain Teasers section but OK. The rules and the link to the files are at: http://nablax.sourceforge.net/" [Broken] if anybody is interested, you are welcome to check it out. The game requires Java (at least version 1.6.10).