Tag Archives: Limited Pattern Overlay

The Especially Nice Loop of KD Insane 465


This post reports several features of an update of the post that introduced nice loop coloring. The illustrating nice loop was in itself remarkable. As shown already from books 1 through 5, KrazyDad’s hardest, the Insane collection, is hard enough … Continue reading

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LPO Knocks Out World’s Hardest 36


A challenge posed by The Worlds Hardest Sudoku Book 36: Is there a route to the solution less advanced than pattern analysis? The puzzle is otherwise distinguished by a BARN right out of line marking, and a notable lack of … Continue reading

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