there is a map with a space arena,,,somewhere on esf_world,,,that type of thing but there could be a BIG square red button, which turns gravity from 800 - 100
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maybe something that size,,, or could even a smaller but like a built in button in one of the arena polls (in one of the 4 corners)
the gravity change should be possible with abit of scripting,,,Mr.Satan knows best about that lol ^^