An electronic gaming system is disclosed that allows a player to play a game of knowledge, such as a trivia game, while playing a slot machine. The player can preferably use successful trivia game results to access higher reward levels with the slot machine, with each reward level having progressively...http://www.google.co.uk/patents/US6331144?utm_source=gb-gplus-sharePatent US6331144 - Electronic gaming device offering a game of knowledge for enhanced payouts
