When this popped up (note: weekly notification only ) my first thought was that this should be straightforward as I'm pretty good at SuDoKus. Then I go to the page and scroll down. Ah......... it a 16 by 16, I've never done one of those. Not to be daunted I get stuck in and some time later I have a solution which GeoChecker verifies. So this morning, in beautify sunshine, it was out to fetch it. Initially I can't seem to get closer than 60ft, according to by GPS. Then it jumps to 2ft and sure enough there it is. Nice puzzle. Nice cache location. Went on to stroll along to Colley Hill and thence to GC17PA2.