I recently worked on fun series of non-geocaching puzzles in a Labor Day Extravaganza, which contained a super hard sudoku variant that you might like to check out in this file, on the late page, called "Thunderbirds". It was really tough but I managed to get through it in the end, due to having a little practice with a more basic form in this memorable puzzle, featured back in 2015:
Skyscraper Sudoku
Tomorrow we'll ...
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