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Is there a major difference between the 3rd and 4th edition rules? The reason I ask is I bought quite a few books this year that use the 3rd Editon rules and I want to know if I can use them with 4th Ed. One book I have is A Magical Society Beast Builder. It was published in 2005, uses the...

I have seen a few books on creating adventures, campaigns and worlds, but have seen no books about creating original rules systems for RPGs. So I was wondering has anyone seen anything like this?