Godomuga (分幻鬼 ゴドムガー Bun Genki Godomugā?, lit. "Splitting Illusionary Ogre Godomuga") is a boss in the Contra series. They are a pair of robotic defense systems that can create illusory split images of themselves.
Godomuga are a pair of floating defense mechanisms capable of creating "phantom" duplicates of themselves. Each of the devices is only vulnerable when its two phantom images come back together. They attack by launching projectiles that follow the player in a looping arc. Both Ledder and Garth infantry units are usually seen entering the fight to assist this boss.
In Contra 4, Godomuga reappears as the boss of the third level, Base. In here, it periodically splits into two virtual blinking images that initially separate a short distance before retracting and merging. They merge at a different spot each time. All heads, whether merged or virtual, emit bubble dimers. After sustaining some damage, they take longer to merge, moving around and crossing over each other a few times before doing so.
In the first phase, the boss is vulnerable only in the single, merged form. At the beginning of the encounter, four barrels are dispensed from four holes at the base of the wall. Afterward, only two are dispensed at a time from holes that are selected randomly. Throughout the first phase, base security soldiers periodically appear.
After sustaining enough damage, phase two begins. Here, the boss stops forming virtual images and instead the head rapidly and eccentrically moves left and right, emitting dimers more frequently. All other enemies stop appearing and the boss is now permanently vulnerable.