Futoshiki is a Japanese number puzzle that combines Latin square logic with inequality constraints. You fill a grid so that each row and column contains every number from 1 to the grid size exactly once, similar to Sudoku, but with greater-than and less-than signs between certain cells that must be satisfied. These inequality clues add a layer of deductive reasoning that pure Latin squares lack, forcing you to consider number relationships as well as placement. Grids range from 4-by-4 beginner puzzles to challenging 7-by-7 grids with sparse clues. The puzzle rewards systematic elimination and careful logic rather than guessing. Each puzzle has a unique solution, and the satisfaction of working through a chain of inequalities to place the final number is genuinely rewarding.