Twin Sudoku

Twin Sudoku, also called overlapping sudoku, connects two grids through three shared columns.

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Keyboard: 1–9 enter · arrows move · N notes · Backspace clear · Ctrl+Z undo

How to Play Twin Sudoku

Solve two 9×9 grids that share a middle column of three boxes.
Each grid has its own nine-cell rows and columns. A row does not extend across all 15 cells.
Every shared cell must obey the rules of both grids.

Begin with the more complete grid, then transfer information through the shared boxes.
Check candidates against both grids in the overlap.
Alternate between the grids when one side stops yielding new numbers.

Is Twin Sudoku free to play?

Yes. Every Twin Sudoku puzzle on Sudoku Shrine is free in your browser, with no account or download.

Does every Twin Sudoku puzzle have one solution?

Yes. Each puzzle is checked by a solver so it has exactly one solution and can be solved by logic alone.

Which difficulty should I start with?

Start with Easy to learn the layout, then move to Medium and Hard once scanning and notes feel natural.

Is my progress saved?

Yes. Your entries and notes are saved in this browser, so you can close the page and continue later.