Tag Archives: 4-fill

PencilPress 81 and Master Class 110


This post concludes the review of PencilPress’ 500+ Sudoku Extreme Puzzles, and adds another puzzle to the review update of Tom Sheldon’s Master Class Sudoku. T The final score was PencilPress Extreme 0, Sysudoku Bypass 10. If “Extreme” means requiring … Continue reading

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PencilPress Extreme 49 and Master Class 60


Two reviews are running in tandem. PencilPress Extreme Sudoku is brings up a Sysudoku Basic issue on 4-fills. Tom Sheldon’s Master Class offers some advanced, but quickly settled examples. Bottom right 49 brings up a Sysudoku Basic  policy question on … Continue reading

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