Start a new game and enter "Shooterman" as a case-sensitive name to unlock all levels and characters.
At any menu screen, hold L1 and press Circle, Triangle, Circle, Triangle, X. Note: This code may not work on all levels.
At any menu screen, hold L1 and press Circle, Square, Triangle, Circle, Square.
At any menu screen, hold L1 and press Circle, Square, X, Circle(2).
At the character selection screen, press Left Analog-stick Left and Left Analog-stick Right to move the portraits in the corresponding direction.
Successfully complete mission 2 in story mode to unlock Luger.
Successfully complete mission 3 in story mode to unlock Rico.
Successfully complete mission 4 in story mode to unlock Hakha.
Sprint and when you start to slow down, rapidly press Circle. This will enable you to continue running while having none left.
When in possession of either the Helghast assault rifle or the shotgun, conceal yourself near funnel-points for maximum effect. The shot-spread pattern is enough to inflict mortal damage on dense groups of opponents. Should the survivors retreat; chase them with a hand grenade. You can easily knock out entire "clumps" of opponents using only two actions. Additionally, when in possession of the sniper rifle, you can take snapshots at "clumps" of enemies. The sniper rifle can eliminate multiple opponents that are "standing-in-line" with a single shot.
When playing as Luger, aim for an enemy's chest or head and use her secondary fire. The secondary fire almost always kills an enemy grunt in one shot (depending on where you shoot them). Also, this fire mode is completely silenced so that none of the other enemy units will know where you are. Additionally, if you cannot find a enemy, use her night vision by pressing Square for an easy shot.
While sprinting, release the button. As soon as you do that, switch your gun. The next gun will automatically appear in your hands.
Press Reload, switch the gun, then immediately switch back to your original weapon.
When using the shotgun, it has two modes of fire (regular shoots one shell, alternate shoots two shells). By pressing both fire buttons, you will shoot three shells, which in most cases is more useful. Try using this on groups or stronger enemies.
The sniper pistol is the weapon that Luger uses. Because the sniper rifle has a horrible red glow, use the sniper pistol instead. It has less power, but on secondary fire it can take out an enemy with a head-shot.
When fighting against one or more Helghast, shoot to the side of them. They will look away for a moment. This gives you a chance for a headshot, as they will not move.
Set your crouch on toggle. While playing, move left to right. While continuing to moving from left to right, begin tapping Circle. While doing this, tap L2. It will seem that you are standing, but you are really crouching. To get out of it, tap L2 again.