A method and game server for selecting a plurality of winners of a game is provided. The method comprises receiving a plurality of sets of player numbers from a plurality of game terminals. Each set has a predetermined number of player numbers. Each number is selected from a predetermined set. The method also comprises determining the plurality of winners of the game by conducting iterative drawing rounds until the number of winners exceeds a winner threshold. Each drawing round comprises: selecting a set of random numbers, the number of random numbers in the set of random numbers being equal to the number of player numbers in the set of player numbers; and identifying as winners any sets of player numbers in which each player number of the set corresponds to one or more of the random numbers selected in either the current drawing round or any previous drawing rounds.