Field guide
How to play Sudoku
Learn how to play Sudoku with clear rules, a repeatable first-move method, candidate notes, common mistakes, and a verified easy puzzle to practice.
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Logic puzzle guides
Start with the rules, then move into one technique at a time. Every guide explains the proof behind a move and links directly to a verified puzzle where you can practice it.
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Sudoku
Field guide
Sudoku techniques that actually help
Learn Sudoku techniques in a practical order: naked and hidden singles, locked candidates, pairs, and X-Wing, with evidence you can verify on the grid.
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How to use pencil marks in Sudoku
Learn how to use Sudoku pencil marks: build accurate candidate lists, update notes after every placement, find singles and pairs, and avoid clutter.
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Nonogram & Picross
Field guide
How to play Nonograms
Learn how to play Nonograms and Picross: read numbered clues, find overlap, mark empty squares, avoid guessing, and practice on a verified mini puzzle.
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Nonogram techniques for clean deductions
Learn reliable Nonogram techniques for Picross and Griddlers: overlap clue groups, anchor edges, close completed runs, and exclude impossible spaces.
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How Nonogram overlap works
Master Nonogram overlap with earliest and latest placements, multiple clue groups, anchored runs, worked examples, and common Picross mistakes.
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Minesweeper
Field guide
How to play Minesweeper
Learn Minesweeper rules, read numbered clues, prove safe squares and mines, use subset logic, avoid common mistakes, and practice on a no-guess board.
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Minesweeper strategies without guessing
Learn Minesweeper strategies beyond basic counting: remaining-mine counts, subset logic, 1-2-1 patterns, edge deductions, and no-guess workflows.
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