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| Unlock Sigma Ship | 100% | |
| Win the game once to unlock the Sigma Ship in random encounters. | ||
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| Final Boss trick | 100% | |
| The final battle with the overlord can be very difficult. However, there is one trick to beating him. Equip a gun type that can shot at a down-left angle. Then simply fly right in front of his forehead, the only place none of his attacks can reach. | ||
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| Psyme endings | 100% | |
| In the final battle with psyme she is in a battle worm and you have to fight her. If you only shoot out the 3 cannons on top she remains alive to the end. But if you shoot out the eyes on the bottom of the screen she dies, and is out of the last cut scene. | ||
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In Sigma Star Saga, Earth is under constant attack by the Krill, an alien race of beings that pilot living ships. The ships patrol the skies and upon encountering trouble they beam the nearest pilot into their control cavity to take over. The Krill's technology is fused onto the pilot, meaning that the brains of the ship - literally - are the pilots flying them.