Make 100 boxes about 1inch by 1inch.
10 rows horizontal and 10 diagnal.
Sell each box for however much you want.
Assign a team the top of the sheet and on the left side of the sheet.
Randomly assign numbers 0 through 9 on the top of the sheet and on the left side of the sheet.
Determine how you want to payout, ususlly halftime score and Final score.
Sit back ad see who wins.