Adjutant Voice Select (training only):
Clear the game once on any difficulty. Enemy Layout Select (training only)
Clear the game once on any difficulty. Rubber Ducky ASW tech:
Beat the game two times on any difficulty. Unlock Special Mission Mode
Clear the game once on any difficulty. Unlock Survival Mode:
Clear the game once on any difficulty. Unlock Ultra Hard Difficulty
Beat game second time. Unlock Very Hard Difficulty:
Clear the game once on any difficulty.
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