- ➊ Write a number between 1 and 9 into each white cell so that eachnumber occurs exactly once in each row and column.
- ➋ The sum of the numbers in a stripe of horizontally or vertically adjacent white cells is given (just like the definitions in a crossword puzzle).
- ➌ The difference between the numbers in two cells separated
by a circle must be exactly one; the difference between the numbers in two
cells
__not__separated by a circle must__not__be exactly one.