A trick play, also known as a gadget play, gimmick play or trickeration, is a play in gridiron football that uses deception and unorthodox tactics to fool the opposing team. A trick play is often risky, offering the potential for a large gain or a touchdown if it is successful, but with the chance of a significant loss of yards or a turnover if not. Trick plays are rarely used not only because of the riskiness, but also to maintain the element of surprise for when they are used.
The offense (left) run a "halfback direct snap": In this case, before the play the quarterback (#9) has gone to the far side of the field (lining up as a receiver), while the ball is being snapped directly to a running back (#22).
A snap is the backward passing of the ball in gridiron football at the start of play from scrimmage.
The center snaps the ball between his legs.
Illustration showing positions of the men just before the ball is passed
Exchange of the snap between the center's legs