The Guardian Legend © 1989 Broderbund Software, Incorporated.
North American release. Game developed in Japan. See the original Famicom version for more information: "Guardic Gaiden [Model IF-08]
Description from the back cover:
Long ago, in a distant galaxy, an alien race sent a huge world - called Naju - hurtling toward Earth, loaded with a cargo of mysterious lifeforms. During the long journey, these creatures have multiplied and become increasingly evil - and now Naju teems with evil. However, deep within this complex globe are self-destruct mechanisms that can be activated to destroy it before it reaches Earth. Now, you must battle your way deep within Naju's labyrinths to destroy it. You are the guardian of Earth and your saga will become The Guardian Legend!
* Great shoot-em-up arcade action combined with underground adventure.
* Choose from twelve different weapons to launch your breakneck attack against the monsters deep within Naju.
* Password feature allows you to end a game in progress and resume it later.