Select (by circling) the digits from 1 to 9 in the grid once each so that each row and column adds up to 9 or less. A completed puzzle will have each number 1-9 circled once, with no other numbers remaining.

• Tap once to remove a number.

• Tap twice to circle a number.

Only nine squares will remain; not every row and column needs to have a number in it, and some rows and columns will add up to less to 9.

You never have to guess. Logic will always be enough to solve.

Detailed instructions, tips, and examples