Use logic to fill each of the nine squares in each row, column, and three-by-three box of these grids with a different number from 1 to 9. There is only one correct solution to each puzzle.
Each grid here contains 12 holes for you to locate in the empty spaces. Each number beside the grid indicates the number of holes in the corresponding row or column. In addition, each arrow points directly toward one or more of these holes. An arrow may be immediately next to the hole it points to, or all the way across the grid from it. Not every hole will have an arrow pointing to it.