Warning - Use with caution. Please don't get into trouble, and look up once in a while so you understand what's going on.

This is for a CASIO calculator, so it might be a bit different for yours. A fraction button is essential for this.

1. Press the fraction button twice, so you have a three blank boxes with a line separating each box.

2. Put a multiplication sign next to the fraction stack.

3. Repeat steps 1 and 2, then do step 1 again.

4. Go back and delete the multiplication signs.

You now have a blank template for X's and O's! It will take a lot of manoeuvring to play, but use multiplication signs for X's and a zero for O's. Have fun!