This is a pretty neat piece of tech. From the website https://doom.hydra.family/: scaling solutions called Hydra using the shareware levels of the 1993 id software game Doom.
>While you are playing, the game states will be streamed into a Hydra head, which uses Cardano smart contracts to validate the game transition for every frame, in real time. It’s a passion project put together by a small team, including Sundae Labs, Adam Dean, and a few folks from IOG, in a short amount of time. All the code is fully open sourced.
>Hydra Doom is intended as a light-hearted tech demo and is not a commercial product.