A method, implemented as computer code being executed by one or more processors, in which a computing device displays computer game graphics showing a gameboard with multiple game elements that are removed when matched or switched, such as in a match-3, clicker or switcher game; and in which, one or more of the processors are programmed such that: (a) to pass a level, the player has to remove a defined number of game elements of several specific collectable types which are present on the gameboard in a limited number of moves, and (b) the gameboard also displays removable elements of one or more other types that the player does not have to remove, and receives no score or points if he does remove.