ODZ(One Dangerous Zombie) is the zombie rigged with tons of grenades / explosive bombs and it bursts out in no time if attacked by the player in any way, and you can have it in the main scenario after beating Normal or higher difficulty with both Chris and Jill as Shadow Reaver already mentioned above.
RatB20 posted...I'm guessing real survivor doesn't count as towards unlocking ODZ?
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Real Survival mode gets unlocked after beating Normal difficulty with EITHER of the two main characters and the zombie doesn't appear as long as you keep playing with the same character you used in the 1st round.
RatB20 posted...I would like a save with all unlocks and the freedom to choose any difficulty without having to play ODZ but also to unlock the trophies.
No, you can't play the main scenario without having to trigger ODZ as you have to play with each character at least thrice or four times if you want to unlock every trophy of the game, and you mean the costumes and extra game modes like Invisible enemy by the word "with all locks", unless you retry the game from New Game again, or are determined to play only RS or Invisible enemy mode... if you wish to use / keep the infinite weapons you gained in the previous rounds
then you can't do that anyway.
My RE4 records - Separate Ways TA : 00:31'09
Mercenaries(PS3,2) Village : 201400 / 187800 Castle : 300970 / 289970 Base : 186900 / 163600 WW : 177700 / 165800