Patent ID: 8721423

Claim:
A gaming machine comprising: a display that displays plural symbols; a processor that (a) controls the display and a gaming session, the gaming session includes a first game and a second game, the first game using base reels, the second game using first special reels and second special reels, and (b) change the gaming session from the first game to the second game when a plurality of trigger symbols are displayed through the base reels on the display as a result of a stop after spinning of the base reels, wherein the base reels on each of which none of the trigger symbols is displayed on the display in the first game are changed to the first special reels in the second game, wherein the base reels on each of which at least one of the trigger symbols is displayed on the display in the first game are changed to the second special reels in the second game, and wherein the second special reel is beneficial compared to the first special reel, and wherein the second special reels increase in number as the first special reels on each of which the trigger symbol is displayed increase in number in the second game.