Christmas challenges

[Richard Russell]

Just a quick reminder that several of David's Christmas challenges haven't received a single response, particularly some that are more logic puzzles than programming tasks. My brain isn't up to solving logic puzzles, but if you want to keep yours ticking over why not try them?

[artfizz]

I'm going to wait until I've had some eggnog and brandy butter to clear my head. Also, someone has already set the bar very high on the programming submissions!