Zombie Nation is a 1990 Shoot 'em up game developed by KAZe and published by Meldac. It was first released in Japan on December 14, 1990 under the title , before being released later in the United States in January 1991. This game features a juxtaposition of zombies, aliens and samurai. In Zombie Nation, the floating samurai head Namakubi goes to the United States to destroy Darc Seed—an alien who crashed to Earth via a meteorite in 1999, turned all the American people into zombies, and took control of various deadly weapons. Namakubi must recover the samurai sword Shura and destroy Darc Seed and its minions. Gameplay Depending on the version of the game, the player controls the giant levitating disembodied samurai head or a giant Tengu mask. The player can destroy structures and enemies by shooting rapid-fire eyeballs and vomit at them. Enemies include zombie snipers, zeppelins and lava monsters. The player can upgrade their firepower by rescuing zombie hostages that leap out of structures when destroyed. The player starts every level with a full life bar of eight units (displayed as mini Namakubi heads on the bottom of the screen), and as the player gets hit, the life bar decreases. When it is down to one bar remaining, the music changes to a dramatic theme. The game ends when the player loses all eight units of the life bar or is crushed by the scrolling of the screen. However, the player can regenerate some of their life by defeating enemies and structures. In addition, the player gets six (increasing by one for every stage section completed, up to a maximum of nine) continues to beat the game. Zombie Nation features two difficulty levels, easy and hard. The game also allows the player, like in the Mega Man series, to select any stage at will. Once a stage is selected the following stages will be played sequentially cycling from stage 4 back to 1. The objective is to clear all four stages and then destroy the final boss, Darc Seed. Story The plot of both Zombie Nation and Abarenbou Tengu takes place in 1999, when a meteor known as "Darc Seed" (Eva in the Japanese version) crashes in the Nevada desert. Darc Seed/Eva then shoots magnetic rays and turns the people of the United States into zombies. Darc Seed/Eva also brings the Statue of Liberty to life to follow