The Gradius games, first introduced in 1985, make up a series of scrolling shooter video games published by Konami for a variety of portable, console and arcade platforms. In many games in the series, the player controls a ship known as the Vic Viper.
Originally released as an arcade game, and later ported to other platforms. It is known to exist on the following platforms: NES/Famicom, MSX, PC Engine, Sega Saturn, PlayStation, Sharp X68000, certain mobile phones, and computer (Saturn, PlayStation and computer versions are all packaged with Gradius 2 as Gradius Deluxe Pack), as well as a re-release of the NES version for Virtual Console). The PC Engine version was also released on the PlayStation Network. In some territories, Gradius was released under the name Nemesis.
Source: Wikipedia, "Gradius," available under the CC-BY-SA License.