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Calcudoku #840

#840 · MediumArchive: not ranked
How to play
  • Fill every square with a digit from 1 up to the size of the grid: 1 to 4 on easy days, 1 to 5 on medium days and 1 to 6 on hard days. No digit may appear twice in a row or a column.
  • The thick lines split the grid into cages. The number and sign in a cage’s corner say what its digits must make: added (+), multiplied (×), or for two squares the bigger minus the smaller (−) or the bigger divided by the smaller (÷).
  • A digit may repeat inside a cage, as long as the two copies are in different rows and columns. A cage of one square is filled in for you.
  • Select a square, then tap the number pad or type a digit. Notes mode adds small pencil marks. Fastest time wins; every grid has exactly one solution.

Calcudoku #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 Calcudoku #840

Calcudoku #840 was the puzzle for Tuesday, October 20, 2026, a medium one: a 5 × 5 grid in 9 cages. Everyone who played Calcudoku that day got the same puzzle, and it stays here to play for 60 days.

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

Other days of Calcudoku

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

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