Tag Archives: coloring traps

Coloring Wrings Out World’s Hardest 102


World’s 102 starts without ‘1’ givens and with two 3-fill lines. It winds up in a coloring trap expansion into a wrap. Basic makes progress in all three phases.               Making a hasty bv … Continue reading

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A.D. Ardson’s Sudoku Diabolical


This post begins a brief review of A.D. Ardson’s Sudoku Diabolical, with a review table and analysis of the first of a pre-selected series 30, 70, . . . , 390. Ardson’s Sudoku Very Hard Puzzles, volume 2, very similar … Continue reading

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