I was on holiday when #2 #3 & #4 of this series came out, and so hadn't attempted any of them when Woking Wonders emailed me a couple of weeks back. It was fun solving the questions during my lunchtimes and on the journey home from work. I managed to finish off #2 and #3 but had a few issues with #4 (as WW1 has mentioned).
Today I was out picking up puzzles with my son Bobcat. We'd DNFed at #1 and I was thinking this one might be tricky too but fortunately Bobcat found it in the second place he tried.