The game-changing technique that will revolutionize how you solve Sudoku. Learn to mark only bi-value candidates and spot patterns instantly — used by speed solvers worldwide.
Learn Snyder Notation →Understand Sudoku before you solve it
GuideNew to Sudoku? Learn what it is, how it works, and why millions play daily.
GuideThe two fundamental rules that govern every puzzle.
GuideComplete step-by-step guide to start solving puzzles.
GuideTrack possible numbers to solve harder puzzles.
GuideFrom 1890s France to global phenomenon.
The game-changing notation system used by world champions
SnyderThe complete guide to bi-value candidate marking — used by 4× World Champion Thomas Snyder.
SnyderNew to Snyder? Start here with a simple, jargon-free introduction.
SnyderWhen to use each method and how to combine them for optimal solving.
SnyderQuick reference card with rules, patterns, and tips — bookmark this!
SnyderGuided exercises to build muscle memory and master the technique.
Your first solving strategies
Level up with candidate elimination techniques
Fish patterns, wings, and coloring techniques
StrategyTrack candidates through strong links.
StrategyContinuous loops with alternating strong and weak links.
StrategyStrong-strong placements and weak-weak eliminations.
StrategyOpen chains through bi-value cells.
StrategyWhen XY-Chains close into loops.
StrategyChute-based contradiction eliminations.
Master-level techniques for the hardest puzzles
StrategyExploit solution uniqueness for eliminations.
StrategyBreak deadly patterns with multiple solutions.
StrategyBivalue Universal Grave — instant solution trigger.
StrategyA powerful single-digit pattern.
StrategyUse empty box patterns for eliminations.
StrategyN cells with N+1 candidates — powerful eliminations.
StrategyTest candidate combinations for contradictions.
