Have done many Sudoku puzzles since I have started Geocaching. Most have been pretty easy to do by the masses since there are many online solvers out there. I have tried to create a Sudoku that I could not find an online solver to. If you find it, congratulations. If not, well, solve it! Puzzle has been updated end of May 2016 as I moved the cache north a hundred or so feet.
Geocache can be found at N 47 31.A0C W 122 16.DEF. Easier now given one value is a 0
This is one of 54 puzzle caches spelling out "WSGA" in honor of the 10th anniversary of Washington State Geocaching Association.
Puzzle help....the grey shaded boxes are either odd or even, depending on which 9x9 square they are in. One 9x9 box has odd ones, one has even ones. You can determine which is which.