Rows and columns are divided into compartments of white squares. Use single numbers to complete a straight for each compartment. A straight is a set of numbers with no gaps and in any order, such as [6,8,7] or [3,2,4,5]. No single number can repeat in any row or column. The black cells separate the compartments. Clues in black cells remove that number as an option in that row and column, and are not part of any straight.