As a foundational 1985 arcade shooter, this main game tasks you with piloting a spacecraft through relentless enemy waves. Its core mechanic is the unique power meter system: collecting items moves a highlight along the meter, requiring you to strategically choose when to activate the desired upgrade (like shields or lasers) before the highlight resets. This introduces a tactical layer to the fast-paced, horizontal scrolling action, demanding precise reflexes and resource management across its challenging stages.
The central appeal of this title lies in its unique approach to player progression and armament management. Unlike many contemporaries where power-ups are immediately applied, this game utilizes a distinct power meter system.
When a player collects a power-up item dropped by an enemy, it does not instantly grant a new weapon. Instead, it moves a highlight along the power meter displayed on the screen. The player must then choose the precise moment to activate the highlighted option.
This mechanic introduces a layer of risk versus reward; players must decide whether to collect another item to reach a desired weapon or activate the current selection before being destroyed.
The strategic depth provided by the power meter is the defining characteristic that sets this game apart. While the core gameplay loop involves constant forward movement and shooting down adversaries, the management of available upgrades transforms simple survival into a tactical decision-making process under pressure.
The game is presented as a pure arcade experience, focusing on high-score chasing and mastering stage layouts. It was initially available on Arcade hardware and later ported to systems such as the Sharp X68000.
This title falls under the Shooter and Arcade genres. It is a main game experience, meaning the focus is on completing the core set of stages rather than ongoing service updates.
This version of the game is documented as being available on the Arcade and Sharp X68000 platforms.
As a classic main game release, there are currently no official DLCs or expansions associated with this specific version.
The content is very mild in impact

PC-8801 port of Gradius.

The PC-Engine port of Gradius


Commodore 64 port of Gradius.

ZX Spectrum port of Gradius.

Amstrad CPC port of Gradius. You are the last hope of the gentle people of Gradius. You've just lifted off to confront the all-out attack of the amoeboid Bacterions. Your hyper-space fighter is armed with the greatest arsenal in the galaxy. Air-to-surface and double beam laser cannons for incredible firepower. Powerful force fields for protection. Time and space warps for fleeing the dimension. You'll need it all just to survive. Because at the heart of the Bacterion Empire lies the Xaerous Superfortress - the nerve center of the all-knowing, all-seeing Bacterion Bio-Computer. It's a duel to the death, while the entire galaxy watches, waits, and hopes!

Sharp X1 port of Gradius.

Nintendo Vs. System port of Gradius, based on the NES version.

This version changed similar to the Famicom version but adds its slew of exclusive content to make up for the downgrade. A new stage, the bone planet was added between the Inverted Volcano stage and the Antennoid stage, featuring exclusive enemy types. There also four hidden warp zones and the ability to play as the titular ship from TwinBee if the MSX version of that game is played alongside Nemesis.

The NES port of Gradius.

The North American version of Nemesis features a considerably increased difficulty compared to the Japanese and European version. To balance this, the game spawns a fleet of orange enemies when the player loses a life to provide as many power-up capsules as possible to recover as many upgrades as possible. Also the North American version presents a continue feature (but only for three times). The title screen was also updated, showing an in-game reproduction of the promotional artwork behind the logo.