Shapedoku Articles · Page 7
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.
Prefer to explore by theme? Browse all articles by topic.
Sudoku vs Tangrams: Constraint Logic and Spatial Assembly Compared
Compare Sudoku vs Tangrams by candidate placement, rotation, shape assembly, spatial reasoning, and the different ways each puzzle limits possibilities.
Read article→Sudoku vs Cryptograms: Constraint Logic and Letter Substitution Compared
Compare Sudoku vs Cryptograms by candidate tracking, substitution, pattern recognition, language clues, and the deduction habits both puzzles reward.
Read article→Sudoku vs Wordle: Candidate Logic and Feedback Compared
Compare Sudoku vs Wordle by candidates, feedback, deduction, vocabulary, repeated letters, and the solving habits that transfer between both puzzles.
Read article→Sudoku vs 2048: Logic Placement and Tile Merging Compared
Compare Sudoku vs 2048 by deduction, tile merging, board control, planning, randomness, and the different thinking and strategy each puzzle rewards.
Read article→Sudoku vs Mastermind: Deduction, Feedback, and Search Compared
Sudoku vs Mastermind compares fixed-grid candidate logic with feedback-driven code breaking. See how elimination, testing, and information differ.
Read article→Fireworks Sudoku: Using Intersecting Strong Links
Fireworks Sudoku combines intersecting strong links to create a small set of guaranteed positions. Learn the core pattern and how it drives eliminations.
Read article→Exocet Sudoku: A Conceptual Guide to Base and Target Cells
Exocet Sudoku uses base candidates and distant target cells in very hard grids. Learn the core relationship, verification mindset, and safe deductions.
Read article→Multi-Sector Locked Sets Sudoku: Understanding MSLS Logic
Multi-Sector Locked Sets Sudoku links candidate locks across several rows, columns, and boxes. Learn the counting idea and a practical search method.
Read article→Avoidable Rectangle Sudoku: A Careful Uniqueness Technique
Avoidable Rectangle Sudoku prevents a deadly two-solution pattern after some corners are solved. Learn when the uniqueness logic is safe and valid.
Read article→Grouped X-Cycles Sudoku: Using Box Segments as Chain Nodes
Grouped X-Cycles Sudoku lets a node represent several candidates in a box segment. Learn how grouped strong links extend ordinary X-Cycles safely.
Read article→Nice Loops Sudoku: How Closed Chains Create Eliminations
Nice Loops Sudoku closes strong and weak implications into a circuit. Learn continuous and discontinuous loop logic without losing the chain.
Read article→ALS Chains in Sudoku: Linking Almost Locked Sets Step by Step
ALS chains in Sudoku connect several Almost Locked Sets with restricted common candidates. Learn how the endpoints force clean eliminations.
Read article→ALS-XY-Wing Sudoku: Three Almost Locked Sets Working Together
ALS-XY-Wing Sudoku links three Almost Locked Sets through restricted common candidates. Learn the pattern, proof, and endpoint eliminations.
Read article→Mutant Fish Sudoku: Mixed Houses in Advanced Fish Logic
Mutant Fish Sudoku mixes rows, columns, and boxes on both sides of a fish. Learn the base-cover idea, verification steps, and common mistakes.
Read article→Kraken Fish Sudoku: Combining Fish Patterns With Chains
Kraken Fish Sudoku uses chains to extend a fish beyond direct fin eliminations. Learn the core idea, branch logic, and a safe way to verify targets.
Read article→Finned Swordfish Sudoku: How to Find and Verify the Pattern
Finned Swordfish Sudoku adds a local fin to a three-line fish. Learn the base and cover sets, the two-case proof, and safe eliminations correctly.
Read article→Sashimi X-Wing Sudoku: How the Incomplete Fish Still Eliminates Candidates
Sashimi X-Wing Sudoku is a finned X-Wing with a missing corner. Learn the pattern, the conditional logic, and where eliminations stay valid.
Read article→Turbot Fish Sudoku: A Practical Guide to the Four-Candidate Chain
Turbot Fish Sudoku links two strong links with one weak link. Learn how to spot the four-candidate chain and make safe eliminations correctly.
Read article→12x12 Sudoku: Rules, Symbols, and Solving Strategy
12x12 Sudoku expands the grid to 144 cells. Learn the 12-symbol rules, 3x4 box structure, candidate tactics, and a manageable solving workflow.
Read article→4x4 Sudoku: Rules and Beginner Strategy
4x4 Sudoku uses digits 1 to 4 in rows, columns, and 2x2 boxes. Learn the rules, simple solving steps, and how the mini grid builds logic skills.
Read article→Butterfly Sudoku: Rules and Solving Strategy
Butterfly Sudoku combines four overlapping 9x9 grids. Learn the shared-region rules, central solving tactics, and a clear workflow for the layout.
Read article→Sohei Sudoku: Rules and Solving Strategy
Sohei Sudoku uses four overlapping 9x9 grids. Learn how the shared corner boxes work, where to start, and how to pass deductions between grids.
Read article→Flower Sudoku: Rules and Solving Strategy
Flower Sudoku links several overlapping 9x9 grids. Learn the rules, how shared boxes transfer information, and a practical solving workflow.
Read article→Sukaku Sudoku: Rules and Solving Strategy
Sukaku Sudoku replaces given digits with candidate lists. Learn the rules, how to read pencilmarks, and how to solve the full grid logically.
Read article→