What are the playing cards used for in the game Resident Evil Genesis on the mobile phone?

In the game resident evil genesis on cell phones, I beat the game with playing cards in my inventory, and I never used them... What are they used for?

What are the playing cards used for in the game Resident Evil Genesis on the mobile phone?
i have no clue. since you beat the game, do you know how to get that safe open in the room behind the fireplace? ive tried everything 11 08 67 11 08 49 i even tried subtracting 18 from it and i still cant figure it out!