**Genre: **Card & Board

Fill in the blanks so that every number from 1-9 appears in each of the nine columns, in each of the nine horizontal rows and in each of the nine 3x3 boxes that make up the grid. Numbers can only be used once in each row, column or box.

Select your level, and then start calculating the fun. Remember, you must fill in the blanks so that every number from 1-9 appears in each of the nine columns, in each of the nine horizontal rows, and in each of the nine 3x3 boxes.

If you're not sure of an answer you can "pencil in" numbers by holding down the **SPACEBAR**, left-clicking the mouse and then typing in the required number from 1 to 9.

If you tire of numbers, switch to letters!