Single Player Minigame ideas

I made a luck based mini game in one of my programs before. It was something like this: There are cards aligned 3x3 “facedown.” The cards in play are a key, door, 3 snakes and 4 blanks. You flip a card of your choice until you’ve either flipped the key and the door (win) or two snakes (loss). You can use this idea if you want.