Iridion II is a scrolling shooter video game developed by Shin'en and published by Majesco Games and Sierra Entertainment in North America and PAL regions respectively for the Game Boy Advance handheld video game console. It is the sequel to Iridion 3D.
After the events in Iridion 3D, the forces of the Iridion disappeared completely which prompted mankind to travel into space and colonize the planets of the Iridion home galaxy. However, after hundreds of peaceful years, the Iridion Empire returned and attacked the human colonists with the intent of retaking their planets. The player assumes control over the SHN-27 en route to save mankind from the Iridion once more.
Players piloted the SHN-27 through three different modes of play, although Story Mode had to be cleared in order to unlock the other modes in the game such as Arcade and Challenge.
In Story mode, players followed an extremely simplistic plot involving the defense fleet chasing the Iridion forces through five different solar systems in three areas each, although each area is symbolized as a planet (including asteroid belts and space travel zones). There were a total of fifteen levels each ending in a boss battle. The other modes included Arcade and Challenge mode, the latter being a boss-attack mode.
Players had to select from one of six weapons at the beginning of each stage, but they could also select and change weapons during game play once a green power-up was collected. Players could also use the Power-ups to empower firing strength or replenish the ship's armor. The green power-ups also increased the shot count by adding two Satellites (or Options) that saddled alongside the ship. The player could change the position of the Satellites depending on the ship's movement, but only while the ship was not firing. Players could also collect Bomb pick-ups and could stock up a total of three. The player's ship was also equipped with a charge shot that, once fully charged, would unleash a very powerful plasma blast. The ship had an armor gauge that once depleted would destroy the ship completely and the players would have to start from a checkpoint.
A unique feature to the game included a brief music mode in the game's main menu where players could change the Lead, Chords, Bass and Drums to the title theme through four different songs.
Source: Wikipedia, "Iridion II", available under the CC-BY-SA License.