Oh, I really like it. I was also thinking of a card game using the rock-paper-scissors method, and since the card game is similar to what I had in mind, I would like to know what code you use. Please share your project if possible. I also want to make cool games like this like bro.
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Can I get your discord? I could send you something there. But I can also tell all the simple things here in comments :). I have one card object and multiple sprites that are randomized. So at first you want your card to have the "back" sprite but when you click/drag/open it you should have something like "if sprite_index = back { sprite_index = choose(rock, paper, scissors);} in click event. And to get that card go to the position where the mouse is just put "x = mouse_x;" and "y = mouse_y;" in mouse down left event.
I also have place where the card goes and that I have done by putting in the collision event with that place "x = place.x" and "y = place.y". But if you would like to have images and files etc I could send them through discord. Just give me your tag and name so I can add you :)