from Simon Tatham's Portable Puzzle Collection

Sorry, this Javascript puzzle doesn't seem to work in your web browser. Perhaps you have Javascript disabled, or perhaps your browser doesn't provide a feature that the puzzle code requires (such as typed arrays). These puzzles have been successfully run in Firefox 19, Chrome 26, Internet Explorer 10 and Safari 6.

Fill in the grid with digits from 1 to the grid size, so that every digit appears exactly once in each row and column, and so that all the arithmetic clues are satisfied (i.e. the clue number in each thick box should be possible to construct from the digits in the box using the specified arithmetic operation).

To place a number, click in a square to select it, then type the number on the keyboard. To erase a number, click to select a square and then press Backspace.

Right-click in a square and then type a number to add or remove the number as a pencil mark, indicating numbers that you think might go in that square.

Full instructions | Back to main puzzles page

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(last modified on Tue Jun 6 01:46:18 2017)