When playing with other players (PvP), game cannot be provably fair because it's not played in real time. Thus I cannot generate hash for provably fairness before the game is played. For these reasons people do not want to prefer PvP mode. To solve this problem, I will give the game creator an option. During game creation, you can say that if you want to change your choice after the second player has played your game. After the 2nd player plays the game, you can change the choice you selected within 12 hours if this option is selected. Also, you will be able to see the choice of the player as hashed as in other games (minesweeper, coin flip). What do you think about this? Is there any other solution suggestion apart from being real-time