Prior to the show, contestants were asked to answer a series of questions while connected to a polygraph, but were not informed of the results. During the show, each contestant is again asked up to 21 of the questions they were asked offscreen. A voice-over, or occasionally the host, announced whether the answer is "true" or "false", based on the result of the polygraph test before the show. The contestant may continue after certain milestones and keep the money they have won so far; giving an answer deemed "false" results in the loss of all the money. The top prize in this version was £50,000.