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Metal Storm is a side-scrolling platforming shooter developed by Tamtex (Company) and published by Irem, released for the Nintendo Entertainment System (Platform) in 1991. Known as Juuryoku Soukou Metal Storm in Japan (which loosely translates into "Gravity Armor"). The game introduced a gravity reversing mechanic, which the player uses to solve platforming puzzles.
The plot revolves around a giant laser cannon that is being controlled by aliens who intend to use it to destroy Earth. The main protagonist of the story is a large robot operated by a man on Earth, who must infiltrate the alien home world in order to stop the destruction of Earth. Eventually, after breaking through the alien planet's defenses, the player must sacrifice his robot in order to destroy the alien home world.
These story elements are only revealed in the instruction manual for the game, and the very limited ending. The game lacks any in-game dialog, cut scenes or non-enemy NPCs.
The key mechanic in Metal Storm is the ability to alter gravity, switching from the ceiling to the floor (when switching, all enemies in the stage are also flipped). Certain enemy types also use the Gravity mechanic as part of their attack.
The game is divided into six stages. Each stage is broken up into two sub-portions. Reaching the end of the first sub-portion provides the player with a checkpoint. If the player dies in the second sub-portion, they start over at the checkpoint. The difficulty of the game is focused around pattern memorization, similar to the most recent Mega Man (Franchise) releases.
The game features several different weapons, each of which alters a certain gameplay mechanic.
The Gun item effects the shooting mechanic. When equipped, it gives the player's gun a wider, more powerful beam. It also has the ability to pass through certain walls, allowing the player to damage an enemy without risking themselves.
The Fireball item affects the Gravity Reversal mechanic. This item makes the player invincible whenever they flip gravity. It allows the player to rocket indestructibly from the floor to the ceiling, and back again. With this item equipped, enemies that run into the player while are are falling back and forth will take damage.
The Shield item effects the player's defense. The shield faces the same way the player points their weapon and it covers one quarter of the player's body. It prevents damage to the player from most attacks, although physical attacks and large beam weapons will ignore it. One of the biggest advantages of the shield is its ability to pass through solid objects. By pressing against walls or floors, the player can "push" the shield through them. Any enemy that the shield touches will be damaged by it continuously. Like the gun, it can help a player attack an enemy without exposing them to damage.
After completing the game, the player is congratulated, but informed that the robot did not survive the alien station's explosion. The player is then given a password which, when entered, restarts the game on expert difficulty. After completing the expert mode, the player will be congratulated again and informed that this time the robot was able to successfully escape the destruction of the alien planet.
The game has 6 normal stages and 1 boss rush stage.
At the end of every stage the screen will go dark, followed by the flashing red text, "RED ALERT," indicating the beginning of a boss fight.
The 1992 Famicom version of Metal Storm is moderately different from the NES version. Major differences include: