SetSquare (PuzzleMadness)

SetSquare is an arithmetic grid. The digits 1 to 9 go into a 3x3 arrangement of squares, each used once, with operation signs between them. Each row and each column is a calculation with a given result. The calculations are worked in order from left to right (or top to bottom), not by the usual rules for multiplication first, which the site points out can change the answer.

The daily page opens today's puzzle on its own, and its title carries the date (on 3 October 2026 it read "Daily Medium SetSquare Puzzle for Saturday 3rd October 2026 (Medium)"). There is a separate dated grid 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 SetSquare monthly and all-time leaderboards, where only your best score on any one puzzle counts.

Start with calculations that have few possibilities, such as a product that can only be made one way within 1 to 9. Then use the fact that each digit is used once to settle the rest. Depending on the level, a starting digit may be given.

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.