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Dan LeKander's 50th puzzle is difficult. You may learn the most when you tackle it yourself before looking at his solution!
Thousand Islands Life Magazine, Sudoku #51
Part I–Sudoku Puzzle Preparation for Dan's steps 1-8 > Thousand
Sudoku Puzzle #41 > Thousand Islands Life Magazine > Thousand
Thousand Islands Life Magazine, Puzzle #54 by Dan Lekander
Puzzler Sudoku Magazine Subscription, Buy at
Thousand Islands Life Magazine, Sudoku Puzzle #60
Sudoku Puzzle #46 > Thousand Islands Life Magazine > Thousand
February Sudoku, a Difficult One! > Thousand Islands Life Magazine
Thousand Islands Life, December Sudoku, #177, #178, #179 & #180
Sudoku Puzzle #35 > Thousand Islands Life Magazine > Thousand
April's Extreme Sudoku Challenge > Thousand Islands Life Magazine
Thousand Islands Life Magazine, Sudoku Puzzle #49
Thousand Islands Life Magazine, Sudoku #48