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Every other sudoku book sorts puzzles into Easy, Medium, Hard, and Expert — and leaves you to figure out on your own why Hard is hard.
Sudoku Unlocked does something different. Ten chapters, each built around one named solving technique, taught in the exact order real solvers actually need them: naked and hidden singles, pairs, pointing pairs, triples, X-Wing, Swordfish, and XY-Wing.
Every chapter follows the same shape: a plain explanation of why the technique works, a worked example with the pattern highlighted directly on a real grid, drills to practice spotting it yourself, and a full set of puzzles built specifically to need that technique — not just puzzles that happen to be hard.
Inside you'll find:
150 puzzles, engineered and verified to need the specific technique being taught 50 bonus worksheets mixing every technique, for after you've finished the curriculum Fully worked examples showing exactly where each pattern hides Complete answer keys explaining not just what you missed, but whyIf you've ever hit a wall on a Hard puzzle with no idea what you were supposed to see, this is the book that shows you.
