Sigma Star Saga Cheats

Defeat the game once to unlock the Sigma Ship in random encounters.

Whether Scarlet appears in the ending or not depends if you pick up the Virus while on earth the second time or not. You can find it in the room above the one where Zart and Tierney were working. You cannot return here after you have left, so decide what ending you want here.
Only available in New Game +

In the final battle with psyme she is in a battle worm and you have to fight her. If you only shoot out the three 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.

To unlock New Game +, beat the game and wait through the credits. At the end, the game will prompt you to save. Do so, and the next time you start the game the completed save file will have a gun data icon by it. New Game + allows you to replay the game with all of your old gun data, and gives you access to several new endings.