I love the RNGdle idea, but I thought it might be even more fun as a way to discover Minecraft seeds. So I spent the day making this.
For the uninitiated, Minecraft is deterministic, so you can determine what exactly the spawn point of a new world looks like if you know the seed number. This project gamifies that discovery process by assigning value to certain generated features, culminating in an overall score. It's just a little dopamine hit + small potential value for people who actually play Minecraft.