Futoshiki is a logic-based number puzzle that challenges players to fill a grid with digits while following a set of simple but demanding rules. Similar to Sudoku in its use of logical deduction, the puzzle also includes inequality signs between certain cells, which indicate whether one number must be greater than or less than another. The goal is to place each number only once in every row and column while satisfying all given relationships. With its clean structure and emphasis on reasoning over guesswork, Futoshiki offers an engaging mental workout for puzzle enthusiasts of all levels.