Puzzle guides
Strategy, technique, and solving tips for every puzzle in the library. Pick a puzzle to read its articles.
Games
Classic puzzle games with number placement and logic.
Logic
Deductive reasoning, pattern recognition, and codebreaking.
- Logic Grid PuzzlesSetting up elimination grids and reading clues efficiently.
- Pattern PuzzlesSpotting the rule in sequences, matrices, and odd-one-out sets.
- Deduction PuzzlesTurning a wall of clues into a single certain answer.
- Red-HandedElimination, and deciding which statement to throw away.
- CryptogramFrequency analysis and the letter patterns that decode ciphers.
Math
Mathematical riddles, brain teasers, and number challenges.
Words
Word-based puzzles: scrambles, searches, and ciphers.
Grid
Grid-based puzzles with spatial reasoning and constraints.
- KakuroCross-sum combinations and the magic of unique run totals.
- SkyscrapersVisibility clues, forced lines, and edge-count deductions.
- BinairoThe three rules of 0s and 1s — and how to chain them.
- Star BattleRegion logic, forced stars, and column/row counting.
- Light Up (Akari)Lighting every cell without conflicts, wall-number logic.
- SuguruFilling cages so no equal digits touch — adjacency reasoning.
- SlitherlinkLoop logic, corner rules, and reading the number clues.
- HashiBridge counting, island degrees, and keeping the network connected.
- NurikabeIsland sizing, wall connectivity, and no-pool reasoning.
- ShikakuCarving the grid into rectangles, one number at a time.
- AquariumWater-level logic from row and column clues.
- HitoriShading duplicates without isolating or splitting the grid.
Sudoku Puzzles
Classic Sudoku and its variants: Killer, Samurai, Jigsaw, KenKen, and Futoshiki.
- SudokuScanning, pencil marks, and the techniques that crack Einstein-level grids.
- Killer SudokuCage sums, the 45 rule, and combination filtering.
- Samurai SudokuWorking five overlapping grids without losing the thread.
- Jigsaw SudokuIrregular-region logic and the law of leftovers.
- KenKenCage arithmetic and Latin-square logic, broken down step by step.
- FutoshikiInequality chains and how to seed a grid from the comparisons.