DEAD SPACE 3 CHEATS

Pure Survival Mode:
Enemies only drop resources, and there’s no ammo, health, or weapon parts to be found. Completion unlocks the MK-II Overclocked Parts Set and a Mega Resource Deposit.
New Game+:
New Game+ is unlocked after you complete the game once. Your inventory will stay the same, but your chapter progress is reset.
Hardcore Mode:
Hardcore mode is harder then the Hard and Impossible modes, you can only save three times during the entire campaign and you're limited to 1 existence. Upon completion you unlock the "Devil Horns", a very special weapon, similar to the foam finger from Dead Space 2.
Retro Mode:
Complete Hardcore mode to unlock the Retro Mode.
Classic Mode:
The Classic Mode is a rewind to the original Dead Space. Single-player only, with no cross-hairs or any resource management elements.

Collectable Rewards:

By collecting...	...you unlock the:
All Weapon Parts	Crafter's Circuit Set
All Blueprints	Builder's Circuit Set
All Circuits	MK-II Overclocked Attachment Set
All Logs	MK-II Overclocked Module Set
All Text Logs	Research Circuit Set
All Audio Logs	Comms Circuit Set
All Artifacts	MK-II Overclocked Tip Set
All EarthGov	EarthGov Circuit Set
All Unitology	Unitology Circuit Set
All SCAF	SCAF Circuit Set
All Alien	Alien Circuit Set

Unlockable Suits:

To unlock the...	...you have to:
Deep Dig Suit	Collect all weapon parts.
Flight Suit	Collect all artifacts.
Hostile Environment Suit	Complete all 10 optional missions.
Dead Space Legends Suit Set	Complete the game.
First Contact Outfit	Included in the Limited Edition.
Witness Suit	Included in the Limited Edition.

Optional Missions Reward:
By completing all 10 optional missions you receive a Hostile Environment Suit and the MK-II Overclocked Frame Set.