Arcade Gradius was first released in Japan for Konami's
Bubble System, an arcade board which allowed operators to change the software through the use of proprietary "Bubble Software" cartridge media based on magnetic
bubble memory. The game was distributed as a standard
printed circuit board in North America and Europe under the title of
Nemesis. 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. The original
Gradius is also included in various compilations such as
Gradius Deluxe Pack for the
PlayStation,
Sega Saturn and
Microsoft Windows, and
Gradius Collection for the
PlayStation Portable.
Hamster Corporation released the game as part of their
Arcade Archives series for the
PlayStation 4 in 2015 and
Nintendo Switch in 2020. This particular version was included by Konami in their
Arcade Classics Anniversary Collection, released in 2019 for the Nintendo Switch, PlayStation 4,
Xbox One and Windows.
Famicom/NES The first home conversion of
Gradius was released for
Nintendo's
Famicom console on April 25, 1986, in Japan. Due to the hardware limitations of the Famicom, many of the level designs were simplified (the Moai stage, for example, lacked the vertical scrolling present in the arcade game), and the maximum amount of options that the player can upgrade to was reduced from four to two. This version added a cheat code that could be entered while the game was paused that granted the player's ship almost all the power-ups. This code appeared again in many later Konami games such as
Contra and
Life Force, ultimately becoming known as the
Konami Code. The international version for the
Nintendo Entertainment System was released in North America in December 1986. It was the first NES game to be released by Konami in the region and, unlike the original arcade game, the title was kept unchanged between regions. It was re-released as part of the
Nintendo Classics service on September 19, 2018. The NES version was made available in arcades as a
Nintendo VS. System board (under the title of
VS. Gradius) and as a
PlayChoice-10 cartridge.
VS. Gradius was distributed to arcades by Nintendo. This version was released by
Hamster Corporation as part of their
Arcade Archives series for the
Nintendo Switch and
PlayStation 4 in 2019, distinct from their release of the original arcade version years prior.
MSX The MSX version of
Gradius was released on July 25, 1986, in Japan, a few months after the Famicom version. It was also released in Europe under the
Nemesis title. 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 cartridge for the MSX version of that game is inserted in the second cartridge slot.
PC Engine The PC Engine version of
Gradius was released in Japan on November 15, 1991. Released on a 2-Megabit HuCard, it had relatively few omissions compared to the NES and MSX versions and added a Desert Planet stage similar to the Bone Planet stage from the MSX version. Because of the lower resolution of the PC Engine compared to the original arcade hardware, the PC Engine features some slight vertical scrolling.
Other platforms In addition to the
MSX,
Gradius was also ported to other
microcomputers shortly after its release, such as the
ZX Spectrum,
Amstrad CPC and
Commodore 64 in Europe (as
Nemesis: The Final Challenge), as well as the
PC-8801 and
X1 in Japan. A port for the
X68000 computer was also included in the early models of the computer. ==Audio==