Best to go to WSEX and read about the interactives. But interactives are like buying stock in a team. You can buy and sell and any time. Most of them like on a game will start out where you can buy a share at 55. If you team covers your stock will go to 100. If you team doesn't cover your stock is worth zero. This is a 1-pay. 1 team pays 100%. On a 4-pay. It's basically the same concept except, 1st pays 100, 2nd pays 50, 3rd and 4th pay 25. So if you pick up a team like florida at $11, and they make the final 4 you make $14 because it pays $25. And if they happen to win you got 8-1 instead of the 12-1 on a futures bet.