Sudoku Tutorials
Learn every solving technique from beginner to expert
Reading Candidates
The foundation. What candidates are and why you need them for every level above 2.
Naked Single
Only one candidate remains in a cell
Hidden Single
Only one cell in a row/column/box can contain a candidate
Naked Pair
Two cells in a unit share the same two candidates
Hidden Pair
Two candidates appear only in two cells within a unit
Pointing Pair
A candidate in a box appears only in one row/column within that box
Box-Line Reduction
A candidate in a row/column appears only in one box
X-Wing
A candidate appears in exactly two rows and two columns forming a rectangle — solvable with classic techniques
Swordfish
X-Wing expanded to three rows and three columns
XY-Wing
Three cells with candidates forming elimination patterns
XYZ-Wing
Variation where the pivot cell contains all three candidates
Skyscraper
Two rows each have a candidate in only two columns with one shared
2-String Kite
Similar to Skyscraper but using a box intersection
W-Wing
Two cells with same candidates linked by a strong link
Simple Coloring
Chains of strong links to find contradictions
AIC
Alternating Inference Chain proving eliminations
ALS
Almost Locked Sets yielding eliminations
Forcing Chain
Following chains to force contradictions or placements
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