A method of conducting a wagering game incorporating an opportunity for a player to increase a primary game award is disclosed. A slot machine primary game award may be increased or decreased pursuant to an optional bonus game. Should the player elect not to play the bonus game, the player is paid the primary game award. Otherwise, the bonus game is conducted and the primary game award is increased, decreased or maintained constant. In one version, a threshold primary game award (e.g., $10.00) triggers the bonus game option.