Create a 10×10 grid
Label one side with the numbers 0 through 9 for one team
Label the other side with the numbers 0 through 9 for the other team
Have players buy one or more squares
Fill all squares until the grid is full
Randomly assign the numbers 0 through 9 to both axes after all squares are sold
Use the last digit of each team’s score at the end of each quarter or at the final score
Match the score digits to the corresponding square
The person who owns the matching square wins that payout
Decide in advance which quarters pay out
Decide in advance how much each quarter pays
If the score ends in 0, use the 0 row or column
If the score ends in 7, use the 7 row or column
Repeat the process for each payout period
Keep the grid visible to all players
Confirm the rules before the game starts