Star Soldier PSP Cheats and Codes
Unlockable: Boss on Parade mode
Complete the game on any difficulty.
Unlockable: Stage Select mode
Clear the Boss on Parade mode.
Unlockable: God difficulty
Finish level 10 on Hard mode. This should unlock the God difficulty setting.
Unlockable: Sound Test
You must get a high score in the Normal, 2-Minute, and 5-Minute modes with all 3 ships in the game.