A gaming device including a plurality of primary reels with a plurality of symbols on each of the primary reels. At least one and preferably a plurality of the symbols on the primary reels are designated as activator symbols. An activator symbol is a symbol that, when generated on a primary reel, is...http://www.google.de/patents/US7611406?utm_source=gb-gplus-sharePatent US7611406 - Gaming device having selectively activated extra reel
