What is "gradius"

is a 1985 horizontally scrolling shoot 'em up video game developed and published by Konami, originally released as a coin-operated arcade game in . It was the first game in the Gradius series of shoot 'em ups. In Gradius, the player maneuvers a spacecraft known as the Vic Viper that must defend itself from the various alien enemies. The game features a power-up system called the "power meter", based upon collecting capsules to 'purchase' additional weapons.

The arcade version of Gradius was released internationally outside Japan under the title of Nemesis, although later releases kept the original title. Home versions were released for various platforms, such as the Famicom/NES, the MSX home computer, and the PC Engine, among other formats. The original arcade game and some of the home versions has also been included in various compilation releases and are available for download in services such as the Virtual Console and PlayStation Network.

The 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. In other games of the series, ships the player controls include the Lord British Space Destroyer, Metalion, Sabel Tiger, Thrasher, Vixen, Alpinia, Super Cobra, Jade Knight, and the Falchion β.