SudoZen
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SudoZen Academy
Sudoku Strategy Guide
From absolute basic cell rules to complex logical proof chains.
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all
basic
intermediate
advanced
master
Naked Single
EASY
Tactic Difficulty: 1 / 6
Hidden Single
EASY
Tactic Difficulty: 1 / 6
Naked Subset (Pair / Triple / Quad)
MEDIUM
Tactic Difficulty: 2 / 6
Pointing Pair / Triple
MEDIUM
Tactic Difficulty: 2 / 6
X-Wing
HARD
Tactic Difficulty: 3 / 6
Y-Wing
HARD
Tactic Difficulty: 3 / 6
Swordfish
EXPERT
Tactic Difficulty: 4 / 6
XY-Chain
EXPERT
Tactic Difficulty: 4 / 6
Jellyfish
MASTER
Tactic Difficulty: 5 / 6
Alternating Inference Chain (AIC)
MASTER
Tactic Difficulty: 5 / 6
Forcing Chain
MASTER
Tactic Difficulty: 5 / 6
DLX Contradiction Chain
EXTREME
Tactic Difficulty: 6 / 6
DLX Direct Assignment
EXTREME
Tactic Difficulty: 6 / 6