
As the PlayStation 2 hardware is more capable than the game's original arcade hardware, in certain technically demanding moments of the game the PlayStation 2 is able to maintain normal operating speed in situations that would normally introduce "slowdown" (half-speed operation) on the original hardware. The Reduce from the SNES port returns the player one step closer to the Vic Viper's original size when hit, giving it protection from two hits. The port is based on the arcade version and has an unlockable Extra Edit mode, which gives the player the freedom to create a weapon array from all included setups and adds the F-Option, R-Option and Reduce II power-ups found in the Super NES port. In 2000, Konami bundled Gradius III and Gradius IV together for release on the PlayStation 2 video game console, as Gradius III and IV. A prime example of its diversity is the "Final Battle" track, which contains numerous variations on the "Crystal World" and "Boss Battle" tracks in Gradius II: Gofer's Ambition. The "Gradius III Symphonic Poetry" track was released by Kukeiha Club on June 5, 1990, and contains many orchestrated tracks from both Gradius III and numerous previous games.

Konami also released a soundtrack album containing music from Gradius III as well as other Gradius games, entitled Gradius Arcade Soundtrack on April 24, 2002. Additionally, several albums containing arrangements of the music from this game were released in the years to follow. Ī soundtrack containing the original music as well as arranged tracks, was released by Konami on the King Records label on February 21, 1990, composed and performed by Konami Kukeiha Club with Miki Higashino. This port was also released for Virtual Console on April 23, 2007, in North America, and in September 2007 in Europe and Japan.
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A harder difficulty called "Arcade" can be unlocked by inputting a code (quickly tapping the "A" button 16 times in 1 second) on the options screen, however, it is simply the same game at a harder difficulty, and not an accurate port of the arcade version. Unlike the original arcade version, the Super NES port is the only one that allow players to continue when they lost all their lives. In 2019 Brazilian computer engineer Vitor Vilela created a romhack version of the game that uses the SA-1 enhancement chip that eliminates slowdown in the game. The Super NES version of the game suffered from severe slowdown. It also introduces a boss called Beacon which awaits the player at the end of the new high-speed stage, which is a counterpart of the high-speed stage in Gradius II. The cell stage is also swapped to being the final stage instead of the sixth stage like in the arcade version, it is also given a whole new layout and soundtrack. It replicates the slowdown of its arcade counterpart and discards the pseudo-3D and crystal/"cube rush" stages.

Some of the weapons available in pre-defined schemes can not be used in custom schemes, and vice versa.Ī port of Gradius III was released for the Super Famicom in Japan in December 1990 and for the Super NES in North America in 1991, with the option of reduced difficulty and additional armaments for the Vic Viper. In addition to new pre-defined weapon schemes, Gradius III introduces the "Edit Mode" players can mix and match missile, double, laser, shield and "special" ("!") power-ups into their own custom combination. The Asian (non-Japanese) arcade release lacks the beginner mode and retrospective introduction sequence, but reduces the difficulty overall.

At the end of the third level, the game will bid the player to try the game again at the normal difficulty ('technical mode'), which can loop endlessly. The Japanese version of the game contains a 'beginner mode' that allows the player to venture through the first three levels at a much easier difficulty. Unlike previous games in the series, Gradius III does not include a continuation feature if the player loses their lives, the game will be over. The game contains the familiar weapons, level layouts, and enemies that have become trademarks of the series. There are also two hidden levels that are based on the early sections of Gradius and Salamander.
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Though the level is completely devoid of any enemies, free floating power-ups are scattered throughout. There are a total of ten levels in the game, with stage 4 being something of a bonus level here, the player controls the Vic Viper in a third-person perspective and must avoid colliding with walls. The player pilots the Vic Viper starfighter to battle the onslaughts of the Bacterion Empire. The original arcade version of Gradius III is known by fans as being considerably more difficult than its predecessors.
