Shapedoku Articles · Page 5
Play smarter, think sharper
Guides for new players, strategies to solve faster, and the real benefits of a daily puzzle habit. Everything you need to get more out of Shapedoku and Sudoku.
Sudoku vs Takuzu: How the Two Logic Grids Differ
Compare Sudoku and Takuzu by their core rules, candidate patterns, repetition limits, difficulty, and the logic each grid rewards.
Read article→Sudoku vs Hidato: Which Logic Puzzle Fits You
Compare Sudoku and Hidato by their rules, solving style, candidate logic, path structure, and the skills each puzzle asks you to use.
Read article→16x16 Sudoku and Hexadoku: Rules and Solving Strategy
Learn how 16x16 Sudoku works, which symbols it uses, and how to manage larger rows, 4x4 boxes, candidates, and scanning.
Read article→Asterisk Sudoku: Rules and Solving Strategy
Learn how the nine-cell asterisk region adds a new all-different unit and creates extra singles, pairs, and candidate interactions.
Read article→6x6 Sudoku: Rules, Box Sizes, and Beginner Strategy
Learn how 6x6 Sudoku works, how its smaller boxes differ from 9x9 grids, and which solving habits make it fast and clear.
Read article→Wordoku: How Letter Sudoku Works and How to Solve It
Learn how Wordoku replaces digits with letters, why the logic stays the same, and how to solve letter Sudoku without extra guesswork.
Read article→X-Sums Sudoku: Rules and Solving Strategy
Learn how outside X-Sums clues use the first digit to set a run length, then use totals and bounds to narrow the grid.
Read article→Greater Than Sudoku: Rules and Solving Strategy
Learn how inequality signs create upper and lower bounds, candidate chains, and precise placements in Greater Than Sudoku.
Read article→Non-Consecutive Sudoku: Rules and Solving Strategy
Learn how the non-consecutive rule changes candidate scanning and creates new eliminations between neighboring Sudoku cells.
Read article→Double Arrow Sudoku: Rules and Solving Strategy
Learn how Double Arrow lines balance endpoint sums with path sums and turn candidate totals into precise Sudoku deductions.
Read article→Rossini Sudoku: Rules and Solving Strategy
Learn how Rossini arrows control the first three edge digits and how missing arrows can create useful negative constraints.
Read article→Anti-King Sudoku: Rules and Solving Strategy
Learn how the anti-king rule blocks equal digits in neighboring cells and creates new scanning patterns across the grid.
Read article→Nabner Lines Sudoku: Rules and Solving Strategy
Learn how Nabner Lines forbid repeats and consecutive digits, then use line length and candidate spacing to solve them.
Read article→Lockout Lines Sudoku: Rules and Solving Strategy
Learn how Lockout Lines use separated endpoints and outside-range digits to create powerful candidate restrictions.
Read article→Zipper Lines Sudoku: Rules and Solving Strategy
Learn how mirrored pairs on a Zipper Line sum to its center digit and use pair combinations to narrow the grid.
Read article→Fog of War Sudoku: Rules and Solving Strategy
Learn how to solve Fog of War Sudoku by revealing hidden cells through forced placements while avoiding guesses and stale assumptions.
Read article→Clone Sudoku: Rules and Solving Strategy
Learn how matching clone regions copy digits by position and use candidate intersections to transfer information across the grid.
Read article→Fortress Sudoku: Rules and Solving Strategy
Learn how shaded fortress cells compare with neighboring white cells and turn inequality chains into useful Sudoku deductions.
Read article→Dutch Whispers Sudoku: Rules and Solving Strategy
Learn the Dutch Whispers rule and use four-or-more differences, candidate ranges, and line interactions to solve the variant.
Read article→Disjoint Groups Sudoku: Rules and Solving Strategy
Learn how matching positions across all nine boxes form extra groups and create new singles, pairs, and locked candidates.
Read article→Region Sum Lines Sudoku: Rules and Solving Strategy
Learn how equal sums across box segments create equations, candidate totals, and useful deductions in Region Sum Lines Sudoku.
Read article→Modular Lines Sudoku: Rules and Solving Strategy
Learn how modular lines cycle through three remainder groups and use that pattern to narrow candidates across the grid.
Read article→Entropic Lines Sudoku: Rules and Solving Strategy
Learn how every three cells on an entropic line must include one low, one middle, and one high digit.
Read article→Battenburg Sudoku: Rules and Solving Strategy
Learn how Battenburg markers control odd-even checkerboards and turn parity patterns into precise Sudoku deductions.
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