Guardian Core is the first form of the final boss, a large Gunwall, that as the name suggests, protects the ship of the unnamed antagonist of Interstellar Assault. When defeated, the player exits the enemy base and follows the Escape Pod containing the enemy.

Attack Patterns

Pirior the battle, floor and cieling tiles will rip off and home towards the player.
It's top and bottom cannons shoot bouncing spherical energy bullets, and occansionally fires a large laser beam from the middle core.


There is a safespot in this battle - the small gap, directly where the laser is fired - all of the bosses' attacks will miss the player if he waits here. This makes this phase very easy.

Game Boy Gradius games
Ships Vic ViperCoreship
Nemesis (Game Boy) Bosses VolcanoSuper Big CoreZub RushCrawlerMaru MaruStrikerIron Maiden MK 2RecklessMother Computer Z
Gradius: The Interstellar Assault Bosses Infected StatueCore ReactorVolcano CoreKeeper's Core EXGuardian CoreEscape Ship
End Bosses & Major Enemies
Major Recurring Foes GoferBacterionDr VenomZelos Force (Zeros)Lars EmpireGofer Sisters
Minor Enemies BrainO.V.U.M.Eleos BrainMother Computer Z Guardian CoreCentral Server Genocide CoreOuter Limits / Metal SlaveZelos BarrierDoomDark Force