- ➊ Blacken some cells of the diagram [paper] resp. color the gray cells of the diagram black or white [interactively].
- ➋ The black cells form stripes which are one cell wide. The number, sequence and lengths of the stripes are specified by the clue number sequences on the top and on the left edge of the diagram.
- ➌ Each clue number defines the length of a stripe in the corresponding row resp. column.
- ➍ Two stripes of black cells are separated by at least one white cell.