Abstract: In order to prevent stockpiling of tickets and to encourage the purchase of more tickets, a system is provided whereby game instructions are announced subsequent to distribution of the tickets. The game instructions notify the players as to which game areas in a ticket playing field they must unmask in order to win the interactive game of chance. The game instructions may be announced during a television program or radio broadcast or any other similar promotional activity and provide the players with the incentive to purchase tickets and to participate in the viewing or listening of the program or other promotion. To safeguard against stockpiling of old tickets, play areas that are not unmasked in accordance with the play instructions automatically invalidate the tickets. Unmasking of the play areas is undisguisable, allowing the game sponsor to readily determine which play areas have been revealed in accordance with the play instructions and which are in violation therewith and are, accordingly, invalid.