Gradius

Gradius

Title screen

Developer:	Konami
Music:	Miki Higashino
Program:	Person A
Art:	Person B
Release date:	1985
Next game:	Salamander

Gradius (グラディウス) is a horizontal-scrolling shoot-em-up developed by Konami in 1985, and is the first game in the Gradius series. It introduced a unique power-up system that allowed players to choose their upgrades, which would become a staple of the series.

Gradius was originally released in arcades in 1985, and has been ported to numerous consoles. Some early ports were localized under the title Nemesis.

Gameplay Overview

Gradius is a three-button shooter (two in most ports). There are seven stages in the game (although some ports feature an additional stage). with the game looping upon completing the final stage.

Controls

• A: Fires the standard shot or laser.
• B: Fires missiles (once activated)
• C: Activates currently selected power-up.

Note: In most ports, A and B are combined into a single fire button.

Weapons

The Power Meter used in Gradius.

When you start the game or lose a life, your ship will only have a horizontal-firing shot. When you destroy certain enemies (indicated by being a different color) or enemy formations, they will drop Power Capsules. With every red Power Capsule collected, the highlighted power-up on the Power Meter at the bottom of the screen will change. When the power-up that you want is selected, press C to receive it. This will reset the process, and you will need to collect more Power Capsules to "purchase" additional power-ups. If the last choice is highlighted and another Power Capsule is collected, the choice will wrap around to the start of the Power Meter.

• Speed Up: Increases the movement speed of your ship. Can be purchased multiple times.
• Missile: Activates usage of missiles. Press B to fire a missile diagonally down. If the missile reaches the ground, it will fly along it until hitting an enemy or obstacle. This is very useful for destroying ground-based enemies.
• Double: Adds a second shot to your standard weapon that fires diagonally up. Cannot be used together with the Laser.
• Laser: Changes your standard shot into a strong laser that fires horizontally and moves up and down with your ship. Hold the button to increase the length of the beam. Cannot be used together with Double.
• Option/Multiple: Adds an option that travels behind your ship, mimicking its movements. Shoots an extra shot/laser or missile every time you fire. You can have up to four at a time (two in some ports).
• ?: Adds two front-facing shields to your ship. Each shield can absorb a certain number of shots before disappearing.

Items

There are two types of collectable Power Capsules in Gradius which appear upon defeating certain enemies or enemy formations.

Item	Description
Red	Collect these to advance the Power Meter.
Blue	Destroys or damages all enemies on-screen when collected. Appears after a certain number of Red Capsules have appeared.

Rank

The rank system in Gradius is based upon a formula that differs depending on which version of the game you are playing. In the western version, renamed Nemesis, the difficulty dip switch settings have a far greater impact. Regardless of the version being played, the rank caps at 15.

Gradius (Japan) rank
rank = ( (survival frames / 1000) + (stages completed * 3) + power + (number of options * 2) + difficulty variable ) / 2
Nemesis (US) rank
rank = ( (survival frames / difficulty variable) + stages completed + power + (number of options * difficulty variable) + difficulty variable ) / 2

The difficulty setting (Easy/Normal/Hard/Very Hard) has a much greater influence on rank in Nemesis:

• Survival frames is divided differently depending on the version played. If playing Gradius, it is always divided by 1000. In Nemesis, the divisor is determined by the difficulty setting as 768/608/512/384.
• Power refers to a value based on the number of power-ups acquired. The value of each power up is static in Gradius, but based on the difficulty setting in Nemesis.

• Missiles add 2 to the value in Gradius, and 1/2/2/3 in Nemesis.
• If the player has four options, add 2 in Gradius, and 1/2/2/3 in Nemesis.
• Lasers add 4 to the value in Gradius, and 3/3/3/4 in Nemesis.
• Shields add 4 to the value in Gradius, and 4/7/8/10 in Nemesis.

• The number of options is multiplied by 2 in Gradius, and 2/3/4/5 in Nemesis.
• The final difficulty variable is 0/2/4/6 in Gradius, and 0/4/8/10 in Nemesis.