Technique atlas
Sudoku Technique Atlas
Every named Sudoku solving technique, organized by family. Learn one family at a time.
Every named Sudoku solving technique, organized by family. Learn one family at a time.
Singles and intersections
These are the tools that prepare the board before real pattern hunting begins.
Subset family
Subset logic traps digits inside a small group of cells or traps cells inside a small group of digits.
Fish family
Fish patterns expand one candidate across multiple rows and columns with symmetric structure.
Single-digit patterns
These track one digit through strong and weak links without requiring a full multi-digit chain.
Wing family
Wing patterns use pivots and pincers to force eliminations several cells away from the center of the pattern.
Coloring and chains
These methods follow implications across the grid instead of staying inside one row, column, or box.
Uniqueness and advanced sets
These techniques lean on uniqueness arguments or larger set logic when simpler candidates refuse to break.