Having trouble with your signal? While waiting for the satellites to align, try lining up the buttons on your cell phone. Using logic, place the digits so that every column, every row, and every box of nine squares has nine different numbers.

To test whether a full row or full column is correct, click on "O" button found at the end of it.
  



Click on a keypad number and then on an open space in the grid.
If you make a mistake, use the EMPTY CELL to erase it.

If you need help, visit Professor Stu Doku’s NINE LIVES tutorial here.
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