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Gradius IV (known in Japan as Gradius IV: Fukkatsu, the sub-title loosely translated to "Revival") is a 2D sci-fi side-scrolling shoot-'em-up developed and released by Konami for arcades exclusively in Japan on February 4, 1999. The fourth main installment of the Gradius (Franchise) series (and the sequel to Gradius III (Game)), Gradius IV puts players back in control of the starfighter Vic Viper as a new force is making their way to the planet Gradius. It is the last entry in the series to be released in arcades. Much of the gameplay from previous games in the series remain intact. However, the "Power Meter Select" system was reverted back to Gradius II: GOFER no Yazou (with two new configurations) and the "Edit Mode" system of Gradius III (along with many of its power-ups) was removed entirely. New additions include special graphical effects (such as polygonal 3D) and a password-based online ranking system. While the game never had a proper standalone home console release, it was bundled with Gradius III as part of the Gradius III and IV compilation for the PlayStation 2 in 2000 (April in Japan, November in both North America and Europe). It was also included in the 2006 PlayStation Portable compilation Gradius Collection.
The Power Meter system from previous games in the series returns, in which players start each life with minimal speed and a basic cannon shot, and can upgrade their ship by collecting Power Capsules to progress through their six-part Power Meter (and then using the Power-Up button to collect the meter's highlighted power-up). However, this game reverts back to the standard Power Meter Select system of Gradius II: GOFER no Yazou, meaning that players can no longer use "Edit Mode" to customize their own weapon loadouts. In addition, many power-ups from Gradius III (Game), including alternate Option types and the Extra power-up slot, have been removed. Players can choose from one of six different Power Meter configurations, followed by two different Shield configurations (Shield and Force Field). All configurations use the same Speed-Up and Option power-ups. The first four Power Meter configurations are the same as in Gradius II, with the first configuration being the same as in the original Gradius (Game).
These power-ups are, in Power-Up Level order:
Increases the movement speed of the Vic Viper. This can be activated up to five times to further increase the speed, although higher levels can be very unwieldy.
Allows the Vic Viper to drop missiles that fall downwards on the playfield separately from its main weapon. Four different types are available in this game:
Improves the Vic Viper's cannon by having it shoot an additional shot. Replaces the Laser power-up.
Replaces the Vic Viper's cannon with a more-powerful laser cannon. Replaces the Double power-up.
Creates a ball of energy that follows behind the path of the Vic Viper and fires the same weapons (and missiles, if active) as the ship. This can be activated up to four times, each of which creating a new energy ball.
Provides a temporary barrier to the Vic Viper that completely negate projectiles in certain directions. These barriers have limited energy and can be destroyed. This Power-Up is marked with the "?" symbol in the Power Meter.