When the number of bets is determined and a game is started, reels start spinning. After a lapse of a predetermined time, fifteen symbols are repositioned in symbol display regions. By dragging and dropping a repositioned symbol to a crater of a volcano, a performance character, an animation effect to...http://www.google.com.au/patents/US20080096639?utm_source=gb-gplus-sharePatent US20080096639 - Slot machine and playing method thereof
