Kill Switch Cheats

In certain levels as soon as you walk into a room about 10 guys
see you and run in different directions.  An easy way to kill them
all is before going into the room hide behind a wall and toss in a
regular grenade.  When the grenade explodes it should kill them
all because they might not notice it.  If any are left just shoot
em of you could through in a flash bang grenade and run in shoot
them (only do the flash bang one if you have low health).  If
multiple enemies are behind an object through a grenade at em but
make sure it goes BEHIND the thing they're hiding behind.  If the
grenade explodes in front of the thing no damage will be done to
your enemy. 

Some enemies hide in areas where you cannot shoot them. Throw a grenade at them and they will jump out of hiding. When they jump out, they will land on the ground on their stomachs. They will require a few seconds to get back up. Before they do, aim and shoot them or they will go back and hide again.

With the game paused, press left trigger, right trigger, X, X. A sound confirms correct code entry.

Beat the game on normal or hard difficulty

Pause the game then hit left trigger, right trigger, X, X. When done correctly you'll hear a sound.

When on any level and there are two enemies talking to each other, throw a grenade (for example at the beginning of the Think Like A Gun level). They will not even look to see what it was because they will be distracted.