Persistent symbol position arrays with array growth in both base game and feature game

A method comprising:

• controlling one or more processors to cause an array of symbol positions to be displayed on one or more displays, wherein:
• the array of symbol positions is defined by a first dimension A and a second dimension B,
• the array of symbol positions has a base state and one or more expansion states,
• the base state and each expansion state each correspond to a different value of the second dimension B,
• each of the values of the second dimension B for the base state and the one or more expansion states corresponds to a different reel strip set of a plurality of reel strip sets, and
• at least two of the reel strip sets are different;
• selecting, in association with a game play of a main game and by the one or more processors, a symbol for each symbol position in the array of symbol positions from the reel strip set corresponding to the value of the second dimension B;
• causing, by the one or more processors, the display, in each symbol position, of the symbol selected for that symbol position in association with the game play of the main game;
• determining, by the one or more processors, whether any of the symbols selected for display in association with the game play is an array growth symbol or are array growth symbols that, in being displayed, meet an array growth condition;
• and
• causing, responsive to determining that the array growth condition is met and by the one or more processors, the second dimension of the array of symbol positions to increment by 1, thereby causing a quantity of additional symbol positions equal to the first dimension to be additionally displayed as part of the array of symbol positions, and additional symbols from the one set of symbols of the one or more sets of symbols to be displayed in the additionally displayed symbol positions.

One or more non-transitory, computer-readable media storing computer-executable instructions which, when executed by one or more processors, control the one or more processors to:

• cause an array of symbol positions to be displayed on one or more displays, wherein:
• the array of symbol positions is defined by a first dimension A and a second dimension B,
• the array of symbol positions has a base state and one or more expansion states,
• the base state and each expansion state each correspond to a different value of the second dimension B,
• each of the values of the second dimension B for the base state and the one or more expansion states corresponds to a different reel strip set of a plurality of reel strip sets, and
• at least two of the reel strip sets are different;
• select, in association with a game play of a main game, a symbol for each symbol position in the array of symbol positions from the reel strip set corresponding to the value of the second dimension B,
• display, in each symbol position, the symbol selected for that symbol position in association with the game play of the main game,
• determine whether any of the symbols selected for display in association with the game play is an array growth symbol or are array growth symbols that, in being displayed, meet an array growth condition, and
• cause, responsive to determining that the array growth condition is met, the second dimension B of the array of symbol positions to increment by 1, thereby causing a quantity of additional symbol positions equal to the first dimension to be additionally displayed as part of the array of symbol positions, and additional symbols from the one set of symbols of the one or more sets of symbols to be displayed in the additionally displayed symbol positions.