Greater Than Sudoku (PuzzleMadness)

Greater Than Sudoku is a 9x9 sudoku where the clues are mostly signs. Between neighbouring squares inside each 3x3 box there are greater-than and less-than signs, and the digits must obey them. Easier grids give some starting digits and every sign; on the Hard grids the example on the site has no digits at all and some signs are left out.

The daily page opens today's puzzle on its own, and its title carries the date (on 3 October 2026 it read "Daily Medium Greater Than Sudoku Puzzle for Saturday 3rd October 2026 (Medium)"). There is a separate dated puzzle for Easy, Medium and Hard. The Mixed page serves a fourth grid of its own, and its level changes from day to day. 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 Greater Than Sudoku monthly and all-time leaderboards, where only your best score on any one puzzle counts.

Look for squares that are smaller than all their neighbours inside a box: they are candidates for 1, and squares larger than all their neighbours are candidates for 9. Chains of signs push digits towards the ends of the range. Once a few digits are in, ordinary sudoku scanning takes over.

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.