Completion bonuses:
Unlock the following bonuses by successfully completing the game on the corresponding difficulty levels:
BONUS – DIFFICULTY LEVEL
Art Gallery 1 and the Cabal guns – Easy difficulty
.50 Desert Eagle – Normal difficulty
Molotov cocktail and the expert difficulty setting – Hard difficulty
Rocket launcher and Cabal rifle – Expert difficulty
Cabal SMG and the Art Gallery 2 – Successfully complete instant action mode under the easy difficulty setting.
Extra Adrenaline – Successfully complete instant action mode under the normal difficulty setting.
Extra Health and the expert difficulty setting – Successfully complete instant action mode under the hard difficulty setting.
Extra Ammunition – Successfully complete instant action mode under the expert difficulty setting.