Jigsaw Sudoku — also called irregular sudoku — is a logic-puzzle variant in which the usual nine 3×3 boxes are replaced by nine irregular, jigsaw-shaped regions. The rules are otherwise…
The XY-Wing — also called the Y-Wing — is an advanced sudoku elimination technique built from three cells that each hold exactly two candidates. It does not place a digit…
The Swordfish is an advanced sudoku technique where a single candidate digit is confined to the same three columns across three rows (or vice versa), letting you eliminate that digit…
Sandwich Sudoku is a sudoku variant that adds a layer of arithmetic to classic logic solving — an outside-clue puzzle built on the familiar 9×9 grid. The grid follows all…
Samurai Sudoku is a sudoku variant made of five overlapping 9×9 grids arranged in an X shape: one grid sits in the center and one occupies each corner. Every grid…
Arrow Sudoku is a Sudoku variant — a sum sudoku where some cells contain circles with arrows running through the grid. Standard Sudoku rules apply, with one extra constraint: the…
NYT Sudoku is the daily number-placement puzzle published by The New York Times Games. Each day brings three new puzzles in Easy, Medium and Hard difficulties, free to play on…
Metro Sudoku is the free online sudoku game on Metro.co.uk, the website of the UK's free Metro newspaper — a daily sudoku puzzle for commuters and casual solvers alike. It…
Daily sudoku is a puzzle format, not a single game: every day, dozens of websites and apps publish one fresh 9×9 sudoku puzzle so players everywhere can solve the same…
Killer sudoku combinations are the sets of unique digits (1–9, never repeating inside a cage) that add up to a cage's printed sum. Learn them and every puzzle gets faster:…
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