The present invention includes an apparatus and method for a gaming device having a bonus game that provides a player with a primary set of reel symbols having a primary probability of winning and a secondary set of reel symbols having a secondary probability of winning, where the secondary probability...http://www.google.de/patents/US20020155880?utm_source=gb-gplus-sharePatent US20020155880 - Gaming device having different sets of primary and secondary reel symbols
