Paper football (also calle Finger football or Flick football) refers to a table-top game, loosely based on American football, in which a sheet of paper folded into a small triangle is slid back and forth across a table top by two opponents and played between 2 players. A long, narrow rectangular table resembling at least somewhat the shape of a football field is needed for satisfactory results. The principal object of the game is to slide the paper football using the thumb and forefinger of one hand in a motion similar to that used in shooting marbles, others may use a flicking motion with the pointer finger to give the "ball" extra spin, so as to come to rest with part of it extending from the end of the table adjacent to the opponent. There are many variations of how to "throw" the ball, such as flicking it with an index finger only, or sliding it by using two fingers, which is easier. This successful shot is a "touchdown" and worth six points. In some cases, it is unclear whether or not a touchdown has been scored, since only a small portion of the ball seems to be over the edge of the table. In this case, some players will "bring out the chains", so to speak, by running a pen or pencil vertically along the edge of the table. If the pen or pencil touches the ball and causes it to move, the touchdown is considered successful. In most versions of the game, if a touchdown was successfully scored, the opponent must then form his fingers into the shape of goalposts, and the player who has just scored the touchdown is then given the opportunity to hold the football on one point vertically at his end of the table and flick it toward the goalposts. If it passes between the opponent's outstretched fingers it is considered a "good" extra point. If not, the game continues.