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Killer Sudoku #840

#840 · MediumArchive: not ranked
How to play
  • Fill every square with a digit from 1 to 9 so that every row, every column and every 3 × 3 box holds each digit once, as in sudoku. No digits are given at the start.
  • The dashed outlines are cages. The small number in a cage’s corner is the sum of its digits, and no digit may appear twice inside one cage.
  • Select a square, then tap the number pad or type a digit. Notes mode adds pencil marks; the line above the grid shows the selected cage’s sum and the digits placed in it.
  • Easy days have cages of two or three squares, medium days up to four and hard days up to five. Every grid has one solution, found by logic alone. Fastest time wins; fewer entries break ties.

Killer Sudoku #840 is the puzzle from Tuesday, October 20, 2026 (medium). Archive puzzles count toward your statistics, not your streak or the leaderboard.

Archive games count toward your statistics, not your streak or the leaderboards.

About Killer Sudoku #840

Killer Sudoku #840 was the puzzle for Tuesday, October 20, 2026, a medium one: a 9 × 9 grid in 27 cages, with no given digits. Everyone who played Killer Sudoku that day got the same puzzle, and it stays here to play for 60 days.

New to Killer Sudoku? The rules, tips and common questions are on the Killer Sudoku page, and How to Solve Killer Sudoku Puzzles goes into strategy.

Other days of Killer Sudoku

Every day of the last 60 is in the puzzle archive.

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