Method of operating a stack symbols progressive game system, a gaming system and a game controller

A method of conducting a game on an electronic gaming machine that includes a credit input, a player interface providing a game play area with a plurality of display positions, and a game controller comprising a random number generator, a processor and a memory storing a) a plurality of reel strips, each of the plurality of reel strips having a plurality of predefined symbols, b) a plurality of stack symbols, c) a plurality of stack arrangements, each of the plurality of stack arrangements defining a number of stacks in the plurality of reel strips, and d) instructions, which, when executed cause the game controller to initiate the game, the method comprising:

• activating, by the game controller, on the player interface a number of display positions that define a height of the game play area from a plurality of different heights of display positions;
• receiving, by the player interface, a gaming input;
• in response to the gaming input, generating, by the random number generator, game symbols for display in the game play area, from the plurality of reel strips, the plurality of reel strips comprising the plurality of predefined symbols and at least one stack symbol of the stack symbols;
• determining, by the game controller, whether a progressive trigger occurs based on the game symbols selected for display and the height of the game play area;
• and
• initiating, by the game controller, a progressive game in response to determining that the progressive trigger has occurred.

A non-transitory computer-readable medium for conducting a game on an electronic gaming machine that includes a credit input, a display providing a game play area arranged in columns of display positions, and a game controller comprising a processor and a memory storing a) a plurality of reel strips, each of the plurality of reel strips having a plurality of predefined symbols, b) a plurality of game heights and a plurality of corresponding lengths of stack symbols, and c) instructions, which, when executed cause the processor to perform at least the steps of:

• selecting a first game height of the plurality of game heights thereby indicating a first length of the plurality of corresponding lengths of stack symbols;
• selecting, by the game controller, symbols for display within the first game height in the game play area from the plurality of reel strips having the plurality of predefined symbols and a plurality of stack symbols defined by the first length;
• determining, by the game controller, if a defined number of columns of display positions are filled with the plurality of stack symbols;
• and
• initiating, by the game controller, a progressive feature in response to determining that the defined number of columns of display positions are filled with the plurality of stack symbols.