A gaming system for conducting a wagering game includes a wager input device, a display for displaying a randomly selected outcome of a wagering game, and a controller operatively coupled to the display and the wager input device to operate in a plurality of selectable game modes of which a selected one is a current game mode. The display has an array of reel strips. Each of the selectable game modes is respectively associated with a subset of the reel strips of the array. A first game mode of the plurality of selectable game modes has at least one reel strip that differs from at least one reel strip of a second game mode of the plurality of selectable game modes. The second game mode has at least one reel strip that differs from at least one reel strip of the first game mode. The controller is operative to cause the display to selectively conceal all of the reel strips other than that subset of the reel strips associated with the current game mode, for example, by causing movement of a reel window or reel strips with respect to the other, or by adjusting the opacity of one or more controllable-opacity segments.