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Inequality Sudoku example
Inequality Sudoku logic puzzles

Also known as: Less-than Sudoku, Greater-than Sudoku

Inequality Sudoku is a Sudoku puzzle with the addition of greater-than (>) and less-than(<) inequality signs between some adjacent squares. These specify that the number in one square must be greater or less-than than square next to it.

The aim is simple: place the digits 1 to 9 into the puzzle grid so that each digit occurs once in every row, column and bold-lined 3 by 3 box, and all of the inequality signs are obeyed.

Some digits might already be given - these, along with the inequality signs, constrain the puzzle in such a way that there is only one possible solution, which can always be reached via reasonable logical deduction. Guessing is never required.


We can supply Inequality Sudoku puzzles in any size and with a range of possible variations - from Inequality Sudoku-X and Inequality Jigsaw Sudoku through to more esoteric varieties such as Skyscraper Inequality Sudoku(!).

All of our puzzles are either entirely hand-made or have significant manual input into the process.

Related Sudoku variations (click for details and samples):
Sample Inequality Sudoku puzzles (click to view press-ready PDF version):
Sudoku Inequality 16x16
Sudoku Inequality 16x16
Sudoku Inequality Jigsaw
Sudoku Inequality Jigsaw
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