Also known as 'More or Less', Futoshiki is a logic-based, number-placement puzzle. The objective is to place numbers into the puzzle cells in such a way that each row and column contains each of the digits less than the size of the puzzle. To give the solver a start, there will be several numbers already in the puzzle. In addition, a few pairs of adjacent cells will have < and > symbols inserted between them to indicate the relative sizes of the numbers within those cells. These 'inequality' constraints must be honored in order to complete the puzzle.