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August 11, 2026
Sandwich Sudoku
Play Sandwich Sudoku free online. Standard Sudoku rules plus outside clues: each number gives the sum of the digits strictly between the 1 and…
July 18, 2026
Anti-Knight Sudoku
Play Anti-Knight Sudoku free online. Standard Sudoku plus the knight-move rule: no two cells a knight's move apart (an L-shape of 2+1 squares, like…
July 15, 2026
Greater-Than Sudoku
Play Greater-Than Sudoku free online. Standard Sudoku plus greater-than and less-than signs between adjacent cells: the open jaw of each sign points toward the…