The Elite difficulty is unlocked after beating the main storyline once. This mode makes enemies even tougher than the Hard difficulty and only gives you your OCP Pistol and a knife, no SMG.
Unlockable How to Unlock Elite Difficulty Beat the game.
Unlocking the 3 different endings.Edit
The ending is determined on what you do at the end of JBA HQ part 2. The only difference between the three endings is a quick 30 second news clip before the credits.
Unlockable How to Unlock Good Ending If you managed to defuse both bombs at the JBA HQ Normal Ending If you managed to defuse only one bomb at the JBA HQ Bad Ending If you didnt defuse any of the bombs at the JBA HQ
With this option you can select the level you want to repeat.
Unlockable How to Unlock Level Select Beat the game.