Hope you don't get bored watching me explain this video while I constantly repeat and correct myself.
Before I explain further, in the end, I made it sound like the engine was the reason why I couldn't finish but that's not the case. You can make any sort of game you like and share it in as quick as 5 minutes, but the issue here is that open-world games are overwhelming to create and you can't do it alone which is why I am just leaving it as a level design concept for an open world game.
This is quite an ambitious idea for an open-world game. This includes story, gameplay, level design, the inspiration behind some places and concepts, and finally, a small summary at the end.
Youtube Video:
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https://youtu.be/FNjnPm3mtE4