Futoshiki
About this puzzle
Futoshiki - also known as "Hutoshiki" or "Unequal"- is a logical math puzzle played on a square grid. The objective of Futoshiki is to enter numbers from 1 to 5 (or whatever the grid dimension is) in each column and each row.
In addition, inequality constraints are given between some of the cells, indicating that one cell must be higher or lower than its neighbour.


