Iridion 3D ROM

Iridion 3D is a quasi-3D rail shooter video game developed by Shin’en Multimedia. A launch title for the Game Boy Advance portable game console, it was released in North America on June 11, 2001 and in Europe on September 21. The player controls a single starship defending Earth from the alien Iridion. The game spans seven levels from Earth to the aliens’ home planet, each following a linear path that culminate with a boss.

Iridion began development as a shooter for the Game Boy Color; when Shin’en decided to drop development and shift their focus to the Game Boy Advance, Iridion was the first game by the developer to appear on the system. Though billed as a 3D game, Shin’en used realtime encoding and resizing to manipulate the size of 2D sprites instead of creating a true 3D environment. More room on the game cartridge was available for graphics due to the game’s use of the GAX Sound Engine, which allowed real-time decoding of song data in a small file size.

The game is a simple forward-scrolling rail shooter, similar to the Star Fox series. Only the Game Boy Advance’s directional pad, A, and Start buttons are used during gameplay. The ship remains locked at a set speed and cannot brake or speed up. In the opening cinematic of Iridion 3D Earth is attacked without warning by the Iridion, who take over much of the surface and lay mines in orbit and bombs in the Pacific Ocean.

The player is the pilot of an experimental SHN fighter, the last hope for defending Earth from the Iridion. The player pilots his ship alone against hordes of Iridion fighters and natural obstacles. The early stages begin on Earth, with the player fighting through an Iridion garbage tunnel. The player proceeds to the Pacific Ocean and destroys much of the Iridion invasion fleet on Earth before heading into the stratosphere to destroy the orbital blockade around Earth and subsequently annihilating the Iridion boss at the Moon.