Hi Kiwi! Thanks for this post!
I’ll answer the questions as requested.
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Minimum 2, Maximum is probably about 6. There’s pretty much limitless people you can have, but it’s just up to how many people you are comfortable GMing.
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In the handbook, it’s states that a GM is needed.
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Not yet, but you’re more than welcome to homebrew something and publish it!
I hope all of this helps! :)