Killer Sudoku
Fill the grid with digits 1 through 9. Each row, column and 3×3 box contains every digit once. The dotted cages add a second constraint: their digits must add up to the printed target without repetition inside that cage. Every complete row, column and box therefore sums to 45.
Controls
Click or tap to select; use 1–9 to enter digits. Arrow keys navigate; N toggles notes; Delete, Backspace or 0 clears. Z undoes and H uses Hint; Pause and Menu stop the active clock
Combine Sudoku with cage sums
Fill the grid with digits 1 through 9. Each row, column and 3×3 box contains every digit once. The dotted cages add a second constraint: their digits must add up to the printed target without repetition inside that cage. Every complete row, column and box therefore sums to 45.
Use the board tools
Select a cell and use the number buttons or keyboard. Notes keep possible values separate from entries. Undo restores a previous step. A native Hint fills the selected empty cell and marks the run as assisted. Visible conflicts help identify an entry to reconsider.
Return to the same puzzle
Choose a difficulty or the dated daily challenge. The finite puzzle bank can repeat. Unfinished progress, notes and recent Undo steps are saved in this browser. Continue resumes that progress; clearing browser data removes it. Assisted results remain separate from the best unassisted time.