If you were clearing enemies rather quickly, Xevious ramped up the challenge by throwing a different type of enemy at you. that adapted the challenges of the game to your performance. In addition to this realistic Artificial Intelligence, the game itself also ran on a kind of A.I. It runs on three Zilog Z80 run at 3.072 MHz.

Instead, they get as close as possible, take a good shot at you, and retreat to the top or the sides of the screen. Endoh did not think that a real enemy would behave so recklessly. Unlike those games, enemies do not sit passively in a formation or take kamikaze dives at your ship. Following the wake of popularity of games like Space Invaders, Galaxian, and Galaga, Endoh desired to make a far more realistic game. Xevious was one of the earliest vertical scrolling shootemups, and undoubtably shaped the shoot 'em up genre that it helped to create. Xevious Resurrection is another special version of Xevious, but created for Namco Museum Essentials.Xevious is an arcade game designed by Masanobu Endoh, one of Japan's most respected game creators and the mastermind behind Namco's later arcade hit of '84, The Tower of Druaga. Xevious Arrangement was a special version of Xevious created for Namco Classic Collection Vol. Xevious 3D/G, released in 1995 for arcades and the PlayStation, added 3D graphics while retaining the 2D viewpoint of the original. Solvalou, released in 1991 in Japan, is a version of Xevious shown from the first-person perspective. Super Xevious, released a year later on the arcades, was a harder version of the original with several new enemies. Mobile versions were reeleased in 2016 by Dream Factory. The NES version of Xevious was also released for Game Boy Advance as part of the Classic NES Series. The game was also part of the Microsoft Revenge of Arcade compilation for the PC. The game was released as a Xbox Live Arcade game on the Xbox Live Marketplace for 400 MSP ($5), which was later included in Namco Museum: Virtual Arcade for the Xbox 360. The original Arcade game has been in many of Namco's compilations, including Namco Museum Volume 2 for the PlayStation, Namco Museum: 50th Anniversary for the PlayStation 2, Xbox, and Gamecube, Namco Museum Remix for the Wii, Namco Museum DS for the Nintendo DS, Namco Museum Battle Collection for the PSP, and Namco Museum Essentials for the PlayStation Network (PS3). Xevious was ported to many systems, including the NES, Atari 8-bit, Atari 7800, NEC PC-8801, NEC PC-9801, MSX, FM-7, ZX Spectrum, Commodore 64, Atari ST, Apple II, Amstrad CPC, Sharp X1, and the Sharp X68000. Another rare Arcade glitch gave the player countless amounts of lives. It's possible to see a short message showing the programmer's name by moving to the bottom-right of the screen, holding down the bomb button and destroying the first two enemies. The game was also known for its glitches and Easter eggs. It is also one of the first shoot-em-ups to include a boss, the massive flying fortress Andor Genesis. It is one of the first shoot-em-ups to include hidden bonuses, which could be uncovered by bombing particular areas in the game (these include the SOL towers, which takes one bomb to reveal and one to destroy, and special flags). The game contains both enemy aircraft and enemy ground units, such as tanks and turrets.

The player controls a Solvalou, a combat aircraft containing both a front-firing 'shooter' for anti-air combat and a 'bomber' for air-to-ground bombing runs. The game was also considered to be the first Arcade game to have a television commercial aired for it in the United States. Xevious was a huge cult hit in Japan, despite its limited popularity in the United States. The game is known for having one continuous level, featuring forests, bases, temples, and waterways. It is one of the first games of its genre, and contributed many things to that genre, including the concept of bosses. Xevious is a vertical scrolling shoot-em-up developed by Namco and released in the Arcade in 1982.

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