If time runs out or they get the question wrong, it is considered a loss of down and the ball stays where it was. The offensive team keeps the ball until they either score a touchdown, kick a field goal, loose the ball on downs, or opt to punt the ball to the other team. A touchdown is 7 points, the extra point being automatically included for convenience. I also have mixed in their a blocked punts and even a fake punt for big yardage. The offensive team punting the ball reaches into the envelope and selects a punt slip, then the defensive team takes over after the ball has been moved the appropriate distance.
Field goals are a little trickier.
The ball must be on the 35 yard line or closer. Flip a coin and heads is good, tails is no good. This is the best I can figure out for this one. The farther away you are, the harder it should be to kick the field goal, I just can't figure an easy way to do it. This is actually a very fun game to play.