I was looking at the Hellmouth concept art and an idea occured to me. What if gravity affected gameplay? This could be a very interesting mechanic, especially on the Moon and Europa. The Moon has about 17% as much gravitational pull as the Earth, and Europa has only about 13.4% as much gravitational pull as Earth. Who needs jetpacks?
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As long as they don't make it too over the top, then ok! :D