There is no one formula for the format of a bonus round. There are differences in almost every bonus round, though there are many recurring elements from show to show. The bonus round is often played for the show's top prize. It is almost always played without an opponent; two notable exceptions to this are "Jeopardy!" and the current version of "The Price Is Right". On "Jeopardy!", the final round involves all remaining contestants with a positive score wagering strategically to win the game and be invited back the next day; "Jeopardy!" attempted to replace this round with a traditional solo bonus round in 1978, but this version was not a success and the round was replaced by the original Final Jeopardy! when the show returned in 1984. "The Price Is Right" uses a knockout tournament format, in which the six contestants to make it onstage are narrowed to two in a "Showcase Showdown;" these two winners then move on to the final Showcase round to determine the day's winner.