Patent US 11,623,148

A computer device having a user interface, a processor, and computer storage. The user interface provides a gameboard comprising tiles supporting game objects, the tiles comprising predefined sets of tiles which are available to support spreading blocking elements. The processor receives a detected user input. If it detects a match condition, the processor removes the game elements of the match condition and generates and displays new game objects to replenish the gameboard. A data structure having tile data is stored in the computer storage. Tile data for tiles of the predefined set(s) comprises a set indicator which indicates whether a tile is in one of the predefined sets. If a blocker spreading mode has been triggered, the processor selects an origin tile which supports a spreading blocking element, identifies a target tile to which the spreading blocking element may spread and generates a blocking element for the target tile.