Drives start at the 40 - yard line .
The offense has three plays to get a first down past the 25 - yard line , three more plays to get to the 10 and another three plays to score .
Drives start at the 40 - yard line , and the offense has three plays to get a first down past the 25 - yard line , three more plays to get to the 10 and another three plays to score .