Passes which intersect triangles have a chance to be intercepted. If a Left or Right shift card has been played the triangles are considered to be one space to the left or right of their printed positions. If the line does not intersect a triangle then the play results in a touchdown. Otherwise play continues from the point where the tackle occured. The normal rules for football apply, so players must advance at least 10 yards within four downs or be forced to turn the ball over to the other player.
Special rules allow for punts, field goals, points after touchdowns, kickoffs and penaltys.
Kicked balls can be affected by the wind. There are fifteen plays in a quarter and the game lasts for four quarters. The player with the highest score at the end of the game is the winner. An interesting game, but Challenge Football does not feel much like football to me. It is really a guessing game where one player tries to guess which card the other player has chosen.