Fortified Zone

Fortified Zone is a 1991 top-down shooter video game developed and published by Jaleco for the Game Boy. The game is about the mercenaries Masato and Mizuki as they go through several environments to penetrate a military fortress. The game is set in a top-down point of view, where the characters shoot at various enemies while traverse four maze-like levels. The player can swap between each character who each have their own abilities ranging from being able to pick up enemy weapons to being able to jump to avoid traps. It was first released in Japan on February 26, 1991, and later released in the United States in September 1991.