A method of playing a wagering game, the wagering game having a basic game and a multi-level secondary game. The method includes conducting the basic game at a gaming terminal. In response to achieving a first-level secondary game entry award, a first-level secondary game is activated. A first set of...http://www.google.se/patents/US20080015012?utm_source=gb-gplus-sharePatent US20080015012 - Wagering Game with Enhanced Progressive Game
