From the introduction:
MAZES & PERILS is a game of role playing in a fantasy world, suitable for ages 10 and up. To play, you need only this rulebook, some dice, paper, pencils, a few friends, and your imagination.
If you have played other fantasy role playing games, the MAZES & PERILS rules may feel familiar to you. Inspired by the 1977 “Holmes” version of the world’s most popular role playing game, MAZES & PERILS goes beyond the introduction provided by the Holmes version, allowing for longer-term campaigns. Even if you don’t need another standalone fantasy role playing game, you may find a few useful new ideas herein that you can use with your other games.