About Killer Sudoku
Fill the grid using Sudoku’s row, column and box rules. Each outlined cage must also reach its printed sum without a repeated digit. Combine arithmetic and crossing clues to fill the stained-glass window.
How to play
- Goal
- Fill the window so every row, column and box holds each number once and every pane adds up to its figure.
- How it ends
- A window is solved when every cell is painted by those rules. There is no way to lose.
- Record
- The fastest first solve of each window, with its holder's name.
- Tap a cell, then a number: every row, column and box holds 1 to 9 once (1 to 6 in a Lancet).
- Each pane's numbers add up to the figure in its corner, and no number repeats inside a pane.
- Switch to Notes to write candidates; a painted number wipes itself from the notes in its row, column and box.
Controls
| Input | Action |
|---|---|
| Tap / click | Select a cell |
| Number pad / 1–9 | Paint a number (again to take it out) |
| Notes / Shift+number | Write a note |
| N / P | Notes mode, paint mode |
| Delete / 0 | Clear the cell |
| Z / Escape | Undo, or return to the windows |
Good to know
All 140 windows are open, deterministic, proved to need no guess and independently counted to one answer. No hints or mistake checks are available. Named fastest times, kept attempts, notes, sound and reduced-motion preference persist in this browser.
