Note: This game is also titled Gun Survivor 2: Biohazard.
Collect all the messages in each level to unlock the Secret Report.
Successfully complete the first mission in dungeon mode to unlock Vs. Roach mode.
Successfully complete the game in Vs. Roach mode to unlock the Panzerfaust EX in Vs. Roach Mode with infinite ammunition.
Successfully complete Inferno mission 6 to unlock Chris Redfield with a Linear Launcher with infinite ammunition in dungeon mode.
Successfully complete all the dungeon missions, including Inferno mission 7, to unlock Rodrigo with only a combat knife in dungeon mode.
Successfully complete the game to raise your partner level to 4 in arcade mode. Complete the game a second time to raise your partner level to 8 in arcade mode.