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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…
Knotwords
Crossword-sudoku hybrid word logic puzzle. Deduce letters from bundles to form valid words.
Palindrome Sudoku
Play Palindrome Sudoku free online. Standard Sudoku plus grey mirror lines where digits must read the same forwards and backwards. 27 unique-solution puzzles from…
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…