Greater number of guards

Greater number of cameras

Available ammo pickups are greatly reduced

You have 2 ration capacity to start, 3 after Owl, 4 after Havoc (Normal maxes at 5)

There is no body armor in Stage 08¹⁾

Most of the bosses have a special addition that make them harder

The Hawk flies faster

Marionette Owl's Dolls heal him if shot

Pyro Bison has a new attack

Havoc can fire double the missiles

BAV1 seems to be the same

MG Gander shoots while walking, Nikita don't spawn during fight

BAV2 will two shot you, on Normal it takes three