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Six techniques, six dedicated pages, six live demo puzzles. Learn the logic that turns any grid into a solvable one, no guessing required.
The easiest win. Find the one cell where only a single number can possibly fit.
A number has nowhere else to go in a row, column, or box, even if the cell looks open.
A candidate trapped in two cells of a box clears itself from the rest of that line.
The mirror of pointing pairs. A line restricts a box instead of a box restricting a line.
A candidate locked into the same two columns across two rows forms an eliminable X.
The three-row cousin of X-Wing. Rare, powerful, and satisfying once you spot it.
Every strategy page ships with its own playable demo puzzle so you can apply what you just read immediately.
Start with Naked Singles