An instruction and reference for designing and building your old Role-Playing Games
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Pen is Mightier than the Sword is a resource for designing your own Roleplaying Games. This book is targeted towards teaching newer Roleplaying enthusiasts how to create simple games and it also makes a great materials resource for seasoned gamers.
(Form page 5 - Inspiration)
Usually the urge to create your own rpg will stem from a movie, television show, or book. Sometimes you'll be lying in bed or standing in the shower and ideas will just start flying through your head, but no matter how you come up with the original idea adding on to it is the fun part.