Field manual / Guides
Logic deserves a clear trail.
Practical guides for finding, comparing and solving deduction puzzles, from Sudoku alternatives to story-led logic games.
How to play Sudoku
Learn how to play Sudoku: understand rows, columns and 3×3 boxes, place legal digits, use candidates and solve your first grid without guessing.
Advanced Sudoku techniques explained
Learn advanced Sudoku techniques including X-Wing, Swordfish, XY-Wing, coloring and chains, with pattern checks and a practical escalation order.
X-Wing Sudoku explained
Understand the X-Wing Sudoku technique with a clear row-and-column example, validation checklist, common mistakes and the exact candidates to eliminate.
Swordfish Sudoku technique explained
Learn the Swordfish Sudoku technique with a three-row example, a precise validation checklist, correct eliminations and differences from X-Wing.
Killer Sudoku strategies that make cages useful
Learn Killer Sudoku strategies including cage combinations, the 45 rule, innies and outies, no-repeat logic and a practical solving order.
Diagonal Sudoku rules and strategies
Learn Diagonal Sudoku rules and strategies: track both main diagonals as extra units, use intersections, avoid false eliminations and solve logically.
Jigsaw Sudoku rules and strategies
Learn Jigsaw Sudoku rules and strategies for irregular regions, including region-line interactions, candidate scanning and common boundary mistakes.
How Samurai Sudoku works
Learn Samurai Sudoku rules, understand the five-grid overlap, organize candidates and use shared boxes to transfer deductions between puzzles.
Sudoku variants and how their rules differ
Compare 12 Sudoku variants including Killer, Diagonal, Jigsaw, Samurai, 16×16, Thermo and Arrow Sudoku by rules, difficulty and skills.
How to solve 16×16 Sudoku
Learn 16×16 Sudoku rules, symbol systems, candidate organization and strategies for solving rows, columns and 4×4 boxes without losing track.
4×4 vs 6×6 Sudoku for beginners
Compare 4×4 and 6×6 Sudoku rules, box shapes, difficulty and learning value, with a step-by-step strategy for each smaller grid.
Logic puzzles for adults that reward real deduction
Compare logic puzzles for adults including Sudoku, Nonograms, Slitherlink, deduction grids and mystery games by reasoning style, difficulty and play time.
Types of logic puzzles and how they differ
Explore 18 types of logic puzzles, from Sudoku and logic grids to Nonograms, loop puzzles, spatial deduction and constraint-programming games.
Detective puzzle games built around deduction
Compare detective puzzle games by clue structure, deduction depth, story, replayability and hint quality, from logic grids to investigation mysteries.
Murder mystery puzzle games compared
Compare murder mystery puzzle games by player count, evidence, deduction, story and replayability, and learn how to choose a fair solvable mystery.
Deduction games and the evidence they use
Compare deduction games by evidence type, certainty, player interaction and replayability, from logic grids and mysteries to social deduction games.
Number games like Sudoku
Compare number games like Sudoku including Killer Sudoku, Kakuro, KenKen, Futoshiki, Hidato and Calcudoku by arithmetic, grid rules and difficulty.
How to choose a Sudoku app without ads
Choose a Sudoku app without ads using a practical checklist for offline play, tracking, subscriptions, puzzle quality, hints and data privacy.
How to choose the best Sudoku app for iPhone
Choose the best Sudoku app for iPhone for your needs by comparing puzzle quality, pencil marks, hints, offline play, accessibility, ads and pricing.
Sudoku strategies
A practical technique order from singles and locked candidates to fish, wings and chains.
Sudoku hints
Find the next logical step with progressive help, concrete examples and no blind guessing.
Games like Sudoku
Twelve logic puzzles compared by deduction style, numbers, arithmetic, story and learning curve.