The Linux Format Bounty round 1 has finished, and I was one of the competers. I ended up doing a JS version of SuDoKu because of my own skills and the fact that JS/HTML is so cross-platform and easy to do GUIs in. I also thought that SuDoKu would be easy on performance, but I was wrong there. It takes alot of resources and JS is slow as a politician's brain. Anyways, it all ended up very playable.
Important update: I fixed a bug showing off solutions for every field in "field info". It was worth a few laughs, though =)