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Unequal (Futoshiki)

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Fill in the grid with numbers from 1 to the grid size, so that every number appears exactly once in each row and column (like in Sudoku), and so that all the > signs represent true inequalities (i.e. the number at the pointed end is smaller than the number at the open end).

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. Press the M key to fill every square with an full set of pencil marks.

In ‘Adjacent’ mode (selectable from the Type menu), bars appear instead of > signs. Cells with bars between them must have adjacent numbers (i.e. one higher or lower), and cells without bars between them must not have adjacent numbers.

Courtesy of Simon Tatham's Puzzle Collection via the MIT license.

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