Custom engine... The game has rewards that are prizes for solving puzzles in the game. For example, there's a flooded cave system, if you figure out how to drain the water out, you'll earn cryptocurrency (bitcon, ethereum, rustbits). Also, the game has playable blockchain cards that you can collect, trade, and use in the game. For example, if you hold the Wasteland card, you can get access to the wastelands planet in the game. We will also support some of the spells of genesis cards too :)