A computer device configured to provide a game to a user and to implement a special game element. A gameboard comprising gameboard locations is rendered on a display. A first set of the gameboard locations comprise tiles supporting game objects, and at least one of the gameboard locations does not comprise a tile. A user input selecting one of user selectable game elements supported by the tiles is received, and the device detects match game conditions. At least one tile of the gameboard supports a special game element, which is activated or triggered when a special game element triggering condition is detected. On detection of the special game element triggering condition, The special game element is triggered to cause it to move to a target gameboard location. If there is no tile at the target gameboard location a new tile is generated on the gameboard at the target gameboard location.