so uh you need 1 dropper 1 dispenser 1 comparator 1 repeater 1 redstone torch 1 chest 1 sign first, construct the dropper, dispenser, chest, and sign like this: (dropper on bottom dispenser on top, i messed up) Second, arrange the redstone components in accordance with their positions in the picture. Now, fill the bottom dropper with cobblestone. Then place 1 cobblestone in the chest. Now, place your prizes in the top dispenser. Keep in mind each slot has a 1/9 chance of dropping its item. As an example: Now, you have constructed the factual least complicated casino possible. I don't think it can get simpler than this. thank u for reading my post that might actually help someone idk