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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!
HAPPY SUDOKU NEW YEAR! > Thousand Islands Life Magazine > Thousand
Sudoku Puzzle Challenge, December 2016 > Thousand Islands Life
Part I–Sudoku Puzzle Preparation for Dan's steps 1-8 > Thousand
March Extreme Sudoku Challenge > Thousand Islands Life Magazine
Sudoku Puzzle # 27, July 2017 > Thousand Islands Life Magazine
Thousand Islands Life Magazine, Sudoku #48
Sudoku Puzzle Challenge-October 2016 > Thousand Islands Life
Sudoku Puzzle #47
Thousand Islands Life Magazine, Sudoku Puzzle #60
Sudoku Puzzle #28 > Thousand Islands Life Magazine > Thousand
Sudoku Puzzle #46 > Thousand Islands Life Magazine > Thousand
Thousand Islands Life Magazine, sudoku Puzzle # 50
Sudoku Puzzle Challenge: Complete Solving Guide > Thousand Islands
Thousand Islands Life Magazine, Puzzle #54 by Dan Lekander
Thousand Islands Life Magazine, Puzzle 55 and Bonus Puzzle 56