Killzone

Type in Shooterman as your profile name and you'll get all the levels.
Note: Capital S and the rest is lower case

Hold L1 on any menu and enter these codes:

In level 8, (Forging a Path) your character uses a Laser Designator to call in artillery strikes against the Helghast. Particularly since it's daytime, the orange scope makes seeing the enemy all the more difficult, and you can't see as far. To get rid of it (And make it easier to see) equip the weapon in the weapon cycle that's before the Laser Designator (So that when you press O it will switch the Laser Designator). Press O to switch to the Laser Designator and immediently sprint forward (L3 is to sprint). If done correctly, the orange tinted overlay should be gone.

Press the sprint button, release and immediately keep pressing circle (switch weapon).If done correctly you will keep on sprinting without running out of stamina.