The present invention provides a gaming device, and more particularly a gaming device having a multi-round bonus scheme wherein each round has a probability of success. In one embodiment, the game maintains and displays a group of symbols, each symbol having an associated selector with which a player...http://www.google.com.hk/patents/US7371166?utm_source=gb-gplus-share專利 US7371166 - Gaming device having a multi-round bonus scheme wherein each round has a probability of success
