A computer-implemented method of controlling a display of a computer device by: rendering on the display a game board having a plurality of selectable game objects, each at a respective tile location in an array. User input is detected to select a game object causing the game object to move in a direction. A game move is implemented in which the selected game object is moved to an adjacent new tile location and swapped with the selected game object. Match data is generated if the move results in at least three game objects of the same characteristic occupying adjacent tile locations, which are removed from the rendered image. New game objects are generated to replace the removed game objects.