Public beta Settings
Public beta · seeded Sudoku
A quiet grid.
A sharp mind.
Settle into a seeded Sudoku. Share its number and everyone receives the same grid, clue for clue.
45
The constant
1 + 2 + ··· + 9
1 + 2 + ··· + 9
Edition
Choose the Sudoku rules
ClassicPlace 1–9 once in every row, column, and 3×3 box.
Use your keyboard or tap a number · press N for notes
01—09
Built for the long game
Less noise.
More noticing.
Sum45 is a daily ritual for people who enjoy the moment a difficult thing becomes clear.
Versioned seeded puzzles Same-grid challenges Clear rule guides Shareable challenge links