Precis Intermedia brings this classic universal roleplaying system (originally published by West End Games) back in PDF format.
FROM THE ORIGINAL BACK COVER:
The Only Rulebook You’ll Ever Need. With the MasterBook rules system, you can adventure in any game universe imaginable. Flexible and easy to learn, the MasterBook rules can be adapted to everything from science fiction to high fantasy, from pulp adventure to dark horror. The only limit to where MasterBook can take you is your imagination! In this book, you’ll find details on creating characters, choosing skills, running combat, magic, miracles and more — everything you need to start adventuring today. MasterBook is a master game system designed for use with published WorldBooks or settings you create yourself. You need two 10-sided dice to utilize this system. MasterDeck™ card deck is optional, but recommended.