We just released an 84 page puzzle book that sits more or less independently of the show (although it does refer to it on occasion), containing a range of some very easy and some *extremely* tricky logic puzzles and brainteasers that I imagine people here would love, and there's an entire meta-puzzle layer that sits on top of it. Check out some screenshots:
A caveat: You need three 'Codebreaker passwords' obtained earlier in the hunt to unlock the puzzle book PDF. It's still possible to get them by via the Codebreakers, playing the games, and watching clips on YouTube (or by asking on our Facebook group)
Hope you guys like it! It's not a commercial thing, no-one is making any money out of it, it's just another nice thing the BBC is giving to the world Speaking as one of the designers, it's been a real labour of love for us. I was the lead designer of the Perplex City puzzle hunt, and The Code treasure hunt is a bit like its spiritual successor, especially since one of our designers is Eric Harshbarger, puzzle and lego dude extraordinaire (plus Perplex City veteran).
Here's the SOLUTIONS thread!