Warship Gunner 2
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
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