Sudoku Made and maintained by Brian Hamilton and Karan Hamilton.
Brian builds the playable puzzle tools, while Karan helps test clarity, difficulty feel, and the player experience.
Playable puzzles and controls are tested in the browser for rule accuracy, usability, and a clear solving experience. See how we make and test puzzles, our editorial standards, or report a problem.
Dog Sudoku: Nine Tiles for Dog People
Dog Sudoku is classic Sudoku played with a kennel's worth of tiles — dog face, dog, poodle, guide dog, service dog, paw prints, bone, tennis ball, and dog house. Play it with pictures, with digits, or with both side by side; either way, each tile appears exactly once in every row, column, and box.
The five-dog problem
Most of our tile sets mix objects that look nothing alike. This one deliberately doesn't: five of the nine tiles are actual dogs. That choice makes the theme feel like a real dog park rather than one dog surrounded by props — but it also makes this the hardest set on the site to scan quickly. And because smaller boards use the first tiles in the set, the 4x4 game is played with four dogs and nothing else. If the poodle and the plain dog start to blur, or the service dog's vest is hard to spot on your screen, switch the display to Both: every tile gets a small number badge, and the argument is over.
The 4x4 board uses only the four dog tiles — dog face, dog, poodle, and guide dog. If a young solver finds them hard to tell apart, Both mode shows a number label on each tile. Same puzzle, easier scanning.
Why the guide dog and service dog are in the set
Those two slots could have held a second bone and a food bowl. The working dogs are there on purpose: plenty of children know a guide dog or a service dog from their street, their school, or their own family, and recognising one on the board makes the puzzle feel like real dogs rather than clip art. The bone, tennis ball, and dog house round out the set as the toys — and like all late-set tiles, they only appear on the full 9x9 board.
Let the youngest player name the tiles
A trick that works better in Dog Sudoku than in any other theme: let the youngest player rename the tiles after dogs they actually know. "The poodle is Auntie Sue's dog" sticks far better than "tile number three", and asking where Biscuit can still go in a box is genuine Sudoku deduction wearing a dog costume. The logic is identical; the sense of ownership is what changes.
The year-round board
Unlike the holiday themes, this page has no month attached — it is the board we point people to when they want a picture Sudoku in the middle of March. Every puzzle has exactly one solution and follows the classic rule: no repeated tile in any row, column, or box. Hints, notes, and difficulty grading behave the same here as on every board we make; the details, and the rest of the pack, are over on Themed Sudoku.
Dog Sudoku FAQ
The smaller boards use the first tiles in the set, and the set starts with the four dog tiles: dog face, dog, poodle, and guide dog. If they are hard to tell apart at speed, Both mode adds a small number label to each tile.
They are the two working dogs in the set, included deliberately: many children recognise them from real life, which makes the board feel like real dogs rather than clip art. On some screens the service dog's vest is subtle — the number badge in Both mode tells them apart instantly.
The puzzles themselves are generated exactly like our number Sudoku, so the logic is identical. Scanning five similar dog tiles can feel slower than scanning digits, which is why the display selector lets you switch to numbers or to both at any point.