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Killer Sudoku
Play Killer Sudoku online free. Cage sum puzzle with four difficulty levels, daily challenge, notes, hints, undo, timer and stats.
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…
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…
Thermo Sudoku
Play Thermo Sudoku free online. Solve 30 hand-crafted thermo puzzles where digits rise along each thermometer. Beginner to Master tiers.
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…
Outside Sudoku
Play Outside Sudoku free online. Standard Sudoku plus outside clues that tell you which digits appear in the border cells of each row and…
Jigsaw Sudoku
Play Jigsaw Sudoku free online. Instead of 3x3 boxes, the grid is divided into 9 irregularly-shaped jigsaw regions. Each row, column, and region must…
Odd-Even Sudoku
Play Odd-Even Sudoku free online. Solve 27 parity puzzles where cells with markers must hold odd or even digits. Beginner to Master tiers.
KenKen Puzzle Online – Math Logic Game
Play KenKen (MathDoku) puzzle online free. Fill grids with numbers 1-N where each row and column has no repeats, and cages combine to target…