The Arduin Adventure (1980)

Sold as a rulebook or as a boxed set of the same rulebook with character sheets and magic item cards.

From the back cover:

This game is an introduction to the world of adventure gaming, and may be learned in less than an hour by anyone age twelve and older. If you are not afraid of trying something new, you will discover a game that is exciting and different from any game you have tried before.

The Arduin Adventure provides the novice with a set of simple and understandable guidelines for learning the basic concepts of Role Playing. Role-playing is the heart of all adventure gaming systems now on the market. Once learned these concepts allow the player to easily understand them.

The Arduin Adventure has a unique modular learning system that permits the gamer to apply any part of it to another system, or part of another system to itself. Although already a complete game, this system is infinitely expandable with the only limit being the player's imagination. So read on and enter the world of action and adventure. It awaits only your participation to come alive!