that allows the player to resume the game at a later time with their progress retained. These Blue Landers also serve as checkpoints; players can restart their game in these designated rooms after being defeated provided the system has not been turned off. In the action-adventure portion of the game known as the "Labyrinth", the player explores the surface of Naju in humanoid form in a top-down perspective. The player must navigate the Labyrinth and find and infiltrate the corridors and ultimately activate Naju's ten safety devices. The Labyrinth consists of screen-wide passages and rooms individually plotted as X–Y coordinates. A map that details these coordinates in a grid-like form can be viewed on the pause subscreen. While the player can generally walk from one screen to the next, some screens are separated by portals called "warp panels". Warp panels bear a symbol indicative of their surrounding area, and the player can only access these warp panels with keys that match these symbols. Some warp panels lead to rooms containing various clues and story elements while others are gateways to shops, password rooms, and corridors. Keys allow players to access different portions of the Labyrinth, which they can then explore in a non-linear fashion. In the shoot 'em up portion of the game known as the "Dungeon", the player battles through Naju's interior in spaceship form. The Dungeon consists of a series of enemy-filled corridors which are found during exploration of the Labyrinth. The player's objective in the Dungeon is to progress through each corridor and defeat the boss at the end. Upon completion, the player destroys the corridor and is returned to the Labyrinth, where a power-up (and sometimes a warp panel key) is collected as a reward. While some corridors can be accessed freely, others can only be entered by performing a particular action in the corridor room. Some rooms in the Labyrinth contain clues that indicate how to unseal these corridors. Ten of the corridors in the game serve as the safety devices which must be deactivated to win the game. Plot In The Guardian Legend, the player controls the gynoid guardian of Earth, a "highly sophisticated aerobot transformer". The player's mission is to infiltrate Naju, a large planet-like object which aliens sent hurtling towards the Earth. While inside, the player must activate ten safety devices in order to initialize Naju's self-destruct mechanism and destroy the alien