Extra is a menu option that is used to access various miscellaneous content related to Resistance 3. This includes cheats, concept art, behind-the-scenes videos, multiplayer skins and titles.
Cheats are bought from the extras store with points earned from trophies and competitive medals. The sole exception is Bloody Hell!, which needed to be unlocked through playing Global Resistance.
My Chimera Virus is acting up again. Resistance: Fall of Man style health regeneration. Invalidates "Brutal" Trophy.
120
All Weapons
All weapons available throughout the game. Invalidates "Brutal" Trophy.****
300
Infinite Ammo
An endless supply of bullets and grenades. Invalidates "Brutal" Trophy.
400
* Also applies to allies such as Havenites and the Remnants. ** Weapons the player has not received yet can be collected and used, but if not used with All Weapons, any weapon that the player is not meant to have at that point in the game will be lost between levels. *** Immersive disables the HUD entirely, and when it is active there is no easy way to tell what grenade type you have equipped, as the HUD is the only indicator of what grenades are available. **** Ammunition for weapons that are not meant to be available will spawn in certain areas, but ammo bins such as the one aboard the boat to Saint Louis and in the Remnant safehouse will not refill ammo for them.