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Completion bonuses
Successfully complete the game under the normal difficulty setting to unlock the following.

Ten Power Nodes
50,000 credits
The back story log entries
Impossible mode
Level 6 suit schematic

Defeating the final Boss
Do not be intimidated by its size. Though massive, it is very easy to kill. The following was done under the Medium difficulty setting. Upon starting the fight, notice you are "caged in" by the Boss' tentacles. Notice the yellow "blooms" around the Boss' mouth. Shooting each one will get you closer to killing it. However, upon shooting a few of them, the boss Grabs you, holding you in the air. During this time, it appears that you are helpless. Aim whatever weapon you are using at the time and shoot the yellow blooms. After a few shots you will be dropped. The Boss will then begin slamming its tentacles at you more frequently. They are very easy to avoid. Strafe left to right constantly. They will never hit you. The Boss will roar, shoot a few exploding cells at you, or will drop enemy pods upon you. This is part is also easy, considering it is usually only two small Necromorphs. After you destroy the blooms, you will notice a "caged" area underneath the beast. Under this rib cage lies its many hearts. Again, use same strategy with the whole tentacle scenario. After a few times, the Boss will have his fit and open up again. Unload and the Boss will come tumbling down.

Defeating the Hunter
The Hunter is a regenerating Necromorph that cannot be killed. The first time you encounter him is difficult, and you just have to run. It is best to shoot off his legs because he does not regenerate them immediately. He is much slower without legs. Then, freeze him and he will be taken away. When facing him again in a later act, use the same strategy then fry him with the rocket engines. Collect the Power Node that it drops.

Defeating the Leviathan
First, take out the tentacles. When the center opens, aim for the orange ball. Take the explosive canisters or the Lathan pod and launch them in the center.

Easy "Kill 30 enemy" trophies
For every weapon you find during the game, there is a trophy awarded when you kill thirty enemies with that weapon. However some weapons are weaker than others (for example, the flamethrower) and you may find it difficult to complete the task. The easiest way to get these trophies is to find a Guardian (fat blob on the wall that shoots out pods) and kill its pods. Each pod counts as a kill, and it will keep re-spawning pods as long as it is alive. You can get all the thirty kill trophies from one Guardian as long as you have enough ammunition.

Easy ammunition
When you are out of ammunition, but have a bench and several Power Nodes, you can refill the ammunition in a weapon to its new maximum by upgrading to a capacity node in that weapon.

Easy credits
Purchase the Contact Gun as soon as possible. Ammunition for it will start appearing around the ship. Sell all of the unneeded ammunition for it for 1,000 credits per unit.

Sell your Plasma Cutter at the store. It is worth quite a lot, but a new one is completely free. This is helpful for the max up challenge, because you can now buy about another seven nodes.

In Chapter 2 when you enter the Zero G Therapy area, there is a hole on the right side of the room along with debris blocking the hallway to other side and where you can see the planet. Once you go through the room on the left and get to the other side, back up to the debris. You can see something flashing outside in the direction of the planet. It is 10,000 credits.

Find the Peng and a note on Impossible mode
Peng is a treasure found in the Hangar in between the two sidewalks. As you leave the Kellion for the first time, look over the railing to your LEFT. There is a small statue lying on the ground. You need KINESIS to get it, so you can't grab it until Chapter 11. IMPOSSIBLE MODE Beat the game on any difficulty, save your game, and start a new game. Choose IMPOSSIBLE MODE, then play until you save your game at a kiosk (in a new slot if you like). The important thing to note is that impossible mode will not remain unlocked if you do not save a game that is playing in impossible mode.

Unlockable - How to Unlock

10 power nodes
Beat the game on any difficulty level

50,000 credits
Beat the game on any difficulty level

Backstory logs
Beat the game on any difficulty level

Military suit
Beat the game on any difficulty level

Finding the Peng treasure
To get Peng you must be on the flight deck on Chapter 13. When in the flight room where your ship "used" to be, look between the walkways. You should see a statue. Pick it up with kinesis and you will receive the Peng treasure (and its achievement or trophy). It can also be sold for 30,000 credits.

Hidden message
Take the first letter of each chapter and arrange them in order to spell out the sentence "Nicole is dead".

More Oxygen in Uncompressed Areas
While Paused, press Square, Square, Triangle, Triangle, Triangle.

Secret Achievements
Achievment - How to unlock

Brute Force (Bronze)
Kill a Brute.

Don't get cocky, kid (Bronze)
Survive the ADS Canon with over 50% Shield strength remaining.

Exterminator (Bronze)
Kill the Leviathan.

Get off my ship! (Bronze)
Kill the Slug Boss.

Kickin it (Bronze)
Escape from a Lurker's grab attack 10 times.

Mindless Prey (Bronze)
Kill the Hive Mind.

Playing Catch (Bronze)
Catch a Brute or Leviathan Pod using Kinesis.

Slugger (Bronze)
Kill the Slug Boss with more than 50% Shield strength remaining.

Secret message key
In Chapter 1, just after you repair the claw for the tram hit your objective finder. Follow the blue line into the hall way where you need to go. Stop as soon as you enter the hallway and look up at the catwalk above your head. Ignore the alien for now. Walk until you find the first corridor on the right. Walk into it there to see writing in an alien language all over. Look down there to see a message that says in English that reads "Don't listen to their lies, read what they're really saying." Keep reading to find a key that shows the alien language, and below that the corresponding are English letters from A to Z and 1 through 0. Although not everything will be legible, you should be able to decipher enough to understand what is written.

In Chapter 6, after fighting the final creature that spills the gas out, there is a dim flashing sign just before the anti-gravity area. This is a codex for some of the letters and all of the numbers in the alien language.

Trophies
Complete the following tasks to unlock PlayStation 3 trophy rewards.

A Cut Above (Bronze): Kill 20 enemies with the Ripper.
Air Alert (Bronze): Zero G jump over 100 times.
All Systems Go (Bronze): Complete Chapter 3 on any setting.
Armstrong (Bronze): TK shoot 50 objects.
Autofire (Bronze): Kill 20 enemies with the Pulse Rifle.
Betrayed (Bronze): Complete Chapter 11 on any setting.
Big Spender (Bronze): Spend 500,000 credits at the store.
Brawler (Bronze): Kill at least 50 enemies with a melee attack.
Butcher (Silver): Dismember 500 Limbs.
Cannon Fodder (Bronze): Complete Chapter 4 on any setting.
Crackshot (Bronze): Achieve a perfect score in the Shooting Gallery.
Dead on Arrival (Bronze): Complete Chapter 1 on any setting.
Epic Tier 3 Engineer (Gold): Complete the game on the hardest difficulty setting.
Exodus (Bronze): Complete Chapter 12 on any setting.
Eviscerator (Bronze): Kill 20 enemies with the Line Gun.
Freeze (Bronze): Use Statis on 50 Enemies.
Full Arsenal (Silver): Own every Weapon in the game.
Full Contact (Bronze): Kill 20 enemies with the Contact Beam.
Greenhouse Effect (Bronze): Complete Chapter 6 on any setting.
Keeper of the Faith (Bronze): Complete Chapter 10 on any setting.
Lab Rat (Bronze): Complete Chapter 2 on any setting.
Legend Teller (Silver): Collect all Logs.
Live with the Hot Ones (Bronze): Kill 20 enemies with the Flamethrower.
Marksman (Bronze): Dismember 5 Limbs.
Maxed Out (Gold): Upgrade all weapons and equipment.
Merchant (Bronze): Collect 5 schematics.
One Gun (Gold): Beat the game using only the Plasma Cutter.
Pack Rat (Bronze): Store 25 items in Safe.
Platinum (Platinum): Unlock all other trophies to unlock this trophy.
Pusher (Bronze): Kill 20 enemies with the Force Gun.
Ragdoll Check (Bronze): Force an enemy into a gravity panel.
Story Teller (Bronze): Collect Half of all Logs.
Surgeon (Bronze): Dismember 250 Limbs.
S.O.S. (Bronze): Complete Chapter 7 on any setting.
Strange Transmissions (Bronze): Complete Chapter 8 on any setting.
Survivor (Silver): Beat the game on any difficulty setting.
Tool Time (Bronze): Kill 20 enemies with the Plasma Cutter.
There's Always Peng (Bronze): Find the Peng Treasure.
True Believer (Bronze): Complete Chapter 5 on any setting.
Wreckage (Bronze): Complete Chapter 9 on any setting.
Z-Baller (Bronze): Complete Level 6 in Zero-G Basketball.

Twinkle Twinkle Little Star
Begin Chapter 10. Walk into the room with the dead Unitologists in it. Listen carefully to hear "Twinkle Twinkle Little Star" from one of the game's trailers. The song can also be hard in an elevator in Chapter 6.

Various Codes
Press Start to pause game play, then enter one of the following codes. A sound will confirm correct code entry. Press Start to resume the game with the code activated. Note: Some codes may only be enabled once per game. Also, codes that have multiple tiers (for example, credits) only take effect when activated in order (lowest to highest).

Refill oxygen
Press Square(2), Triangle(3).

Refill Stasis and Kinesis energy
Press Square, Triangle(2), Square, Triangle.

+2 Nodes
Press Triangle, Square(3), Triangle.

+5 Nodes
Press Triangle, Square, Triangle, Square(2), Triangle, Square(2), Triangle, Square(2), Triangle.

+1,000 Credits
Press Square(3), Triangle, Square.

Although translating that ship number into a code seems to be Down, Square(5), Triangle, Square, only the last portion of the button presses are recognized, which is the "+1,000" Credits code.

+2,000 Credits
Press Square(3), Triangle(2).

+5,000 Credits
Press Square(3), Triangle, Square, Triangle.

+10,000 Credits
Press Square, Triangle(3), Square(2), Triangle.

Wear Military suit in Impossible mode
Successfully complete the game in New Game Plus mode with the Military suit bought and equipped, and save the game immediately before the final Boss. Once the game ends and the credits begin, skip them, and do not save the game when prompted. Instead, immediately start a new game on the Impossible difficulty to start with the Military suit.