Shapedoku Articles · Page 3
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.
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→Sudoku vs Dominosa: Symbol Placement and Domino Pairing Compared
Compare Sudoku vs Dominosa by candidate logic, unique pairs, adjacency, domino tiling, and the deduction style that makes each grid puzzle satisfying.
Read article→Sudoku vs Slant: Candidate Placement and Loop-Free Lines Compared
Compare Sudoku vs Slant by candidate placement, numbered intersections, loop-free diagonals, cycle prevention, and the solving habits each puzzle rewards.
Read article→Sudoku vs Skyscrapers: Set Logic and Visibility Clues Compared
Compare Sudoku vs Skyscrapers by set logic, visibility clues, candidate placement, ordering, height logic, and the solving habits each puzzle rewards.
Read article→Sudoku vs Yajikabe: Placement Logic and Connected Shading Compared
Compare Sudoku vs Yajikabe by symbol candidates, arrow counts, connected black regions, 2x2 restrictions, and the local-to-global reasoning each rewards.
Read article→Sudoku vs Mathrax: Number Placement and Diagonal Arithmetic Compared
Compare Sudoku vs Mathrax by row and column uniqueness, diagonal arithmetic clues, parity, candidate logic, and the reasoning style each puzzle rewards.
Read article→Sudoku vs Easy as ABC: Symbols, Empty Cells, and Outside Clues
Compare Sudoku vs Easy as ABC by symbol placement, row and column uniqueness, empty cells, outside visibility clues, and the logic each puzzle rewards.
Read article→Sudoku vs Calcudoku: Candidate Logic and Arithmetic Cages Compared
Compare Sudoku vs Calcudoku by row and column uniqueness, arithmetic cages, candidate sets, and the different reasoning each number puzzle rewards.
Read article→Sudoku vs Str8ts: Sets, Straights, and Candidate Logic Compared
Compare Sudoku vs Str8ts by row and column uniqueness, compartments, consecutive ranges, black cells, and the candidate reasoning both puzzles reward.
Read article→Sudoku vs Heyawake: Grid Logic and Room Shading Compared
Compare Sudoku vs Heyawake by candidate placement, numbered rooms, black-cell spacing, white connectivity, and the solving habits that carry between them.
Read article→Sudoku vs Tapa: Symbol Placement and Shading Logic Compared
Compare Sudoku vs Tapa by candidate sets, numbered neighbor clues, wall connectivity, 2x2 restrictions, and the visual reasoning each puzzle rewards.
Read article→Sudoku vs Yajilin: Candidate Logic, Shading, and Loops Compared
Compare Sudoku vs Yajilin by candidate logic, arrow clues, shading, loop construction, global connectivity, and the solving habits each puzzle rewards.
Read article→Sudoku vs Battleships: Placement Logic and Fleet Logic Compared
Compare Sudoku vs Battleships by candidate placement, row and column counts, ship geometry, water marking, and the spatial deductions each puzzle rewards.
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