Consecutive Sudoku (PuzzleMadness)

Consecutive Sudoku marks some borders between neighbouring squares with a thick grey bar. The two digits on either side of a bar must be consecutive: they differ by exactly one, like 4 and 5. Otherwise the grid follows the usual 9x9 rules.

The daily page opens today's puzzle on its own, and its title carries the date (on 3 October 2026 it read "Daily Medium Consecutive Sudoku Puzzle for Saturday 3rd October 2026 (Medium)"). There is a separate dated grid for Easy, Medium, Hard and Tough. The Mixed page is a fifth grid with givens of its own, and its level changes from day to day. On 28 October 2026 it was a Medium grid that differed from the Medium page's. Past days stay in the archive, so a missed puzzle can be played later, and there is a print version and an image download of the grid. PuzzleMadness does not publish solutions: the site tells you when you have finished a grid correctly or made a mistake. Each completed puzzle adds to your total on the Consecutive Sudoku monthly and all-time leaderboards, where only your best score on any one puzzle counts.

The site's rules page points out the easiest openings: a bar next to a 1 must lead to a 2, and a bar next to a 9 to an 8. In the middle of the range a bar leaves two options, which often meet the row and column scan to leave one.

PuzzleMadness is a British puzzle site with dozens of daily puzzle types in the browser, from many sudoku variants to logic grids such as Nurikabe, Hashi and Slitherlink. It is free to play and carries ads. A free account keeps track of the puzzles you have finished and puts your name on the leaderboards, and the badges next to usernames mark how many puzzles a player has completed.