The Daily KenKen (SudokuWiki)

The Daily KenKen is one of the daily puzzles on SudokuWiki.org, Andrew Stuart's long-running site about sudoku strategy and solvers. Each day brings one numbered 6x6 grid; the numbers run on without a gap, from No.3033 on 3 October 2026 to No.3051, graded Tough, on 21 October. The new grid goes up a few hours after midnight UTC, at about 03:00, so late-evening players in the Americas and early risers in Europe still meet the previous day's puzzle.

The rules are those of KenKen: put 1 to 6 in every row and column once each, and make the numbers in every coloured cage reach the cage's clue. Unlike a killer sudoku, where cages only add up, a KenKen clue can ask for a sum, a difference, a product or a quotient, so a cage marked 24× and one marked 3÷ need quite different thinking.

There are four grades spread over the week: Diabolical on Monday and Tuesday, Tough on Wednesday and Thursday, Moderate on Friday and Saturday and Gentle on Sunday, and a calendar below the board lists the last 30 days so missed puzzles can still be played. If you get stuck, each day's grid can be sent to the site's 6x6 KenKen solver, which explains the steps.

KenKen on SudokuWiki is a supporters' feature: the board shows to everyone, but playing it asks you to sign in with a supporter membership, taken through Buy Me A Coffee (the Official Supporter tier, £4 a month when checked in October 2026, includes the Daily KenKen). It suits players who already do the site's free daily sudoku, killer and kakuro and want an arithmetic grid alongside them.