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German Whispers Sudoku is a variant of Sudoku in which a supplementary constraint applies to marked lines within the grid: adjacent digits along each marked line must differ by at least 5. The constraint is named after the party game 'telephone' ('Chinese whispers' or 'German whispers'), reflecting...
Between Lines Sudoku is a logic puzzle variant designed for enthusiasts of constraint-based grid deduction. In this format, digits are placed along line segments that connect two circled endpoint cells. The numerical value of every digit along the line segment must fall strictly between the values o...
Dutch Whispers Sudoku is a logic puzzle variant of standard Sudoku in which adjacent digits along specifically marked lines must differ by at least 4. It is named as a variation of the more restrictive "German Whispers" Sudoku, where the difference must be at least 5. This rule requires solvers to u...
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