Subsets (Pairs, Triples, and higher) and Interaction make this harder still!
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Harder Wednesday Sudoku based on 0 ratings. 2 reviews.
very clean presentation - I like the spiral style as it's easy to fold open to the current page. I just wish they would either make the boxes bigger or give quite a few blank grids to work with... sometimes the hatchmarks and dots get to be too busy to figure out my next step!