You’ll need a pen, piece of paper, and nine number cubes. Draw a tic-tac-toe board, and arrange the number cubes so that there is one cube per spot.

Change the face of the cube so that for every possible three-in-a-row (like Tic-Tac-Toe) the dice all sum to the same quantity. Of course, all dice being exactly the same is not a possible answer.

.

.

.