Alien: Disabling smart guns...
	Alien: Out of bounds...
	Alien: Ventilation shaft...
	Civilian fear...
	Crossovers...
	Finding collectibles...
	Marine: Avoiding instant kills...
	Skins...
	Trophies...

Located in several levels are red gas canisters with a small pilot light on them. These can be pushed easily by walking into them. If you can get behind the smart gun, push it as close as possible and strike it once with a heavy attack (should be a tail strike). You will have a small amount of time to flee before it explodes, disabling the smart gun. Note: Some smart guns will require a nearby terminal to be activated and some simply cannot be turned off, as they are used as a device to herd you in a certain direction.

As the Alien you can eventually reach the jungle and exit in a Marine complex. To the far side is a downed ship with "MARLOW" painted on the side. If you climb up this ship you will find a flat area of land on the other side of the electrified fence. Moving too far however will result in an instant death.

As the Alien in level 3, the Queen will tell you to get to the bottom of a shaft with a giant fan at the top. As you get close to it, another Xenomorph will be swept away and blown into the fan. If you use your Focus, you can see two vents on the opposite wall. Choose either of them and you can safely jump to it despite the power of the fan. As you go, you will find more vents to hide in. Use them to make your way down.

In some areas, Civilians will be so terrified of you they will actually kill themselves before you can get to them.

In some levels of the Alien and Marine, you can hear the Predators classic vocal sounds in the background. In some levels as the Alien you can just see the blurry shape of a Predator moving when you enter a new area. There are also Predator Mines laid out in certain areas that only the Alien can reach.

As an Alien or Predator, activate your Focus to have collectibles appear as flashes on the HUD.

In multi-player mode, keep your back against walls to prevent getting killed instantly by Aliens or Predators.

Reach the indicated rank to unlock the corresponding skin.

Marine: Gibson: Rank 2
Predator: Claw: Rank 3
Alien: Warrior Dome: Rank 4
Marine: Connor: Rank 5
Predator: Stalker: Rank 7
Alien: Ridged: Rank 10
Marine: Moss: Rank 13
Predator: Hunter: Rank 16
Alien: Praetorian: Rank 19
Marine: Johnson: Rank 22
Predator: Wolf: Rank 25
Marine: Rookie: Rank 28
Predator: Spartan: Rank 31
Alien: Nethead: Rank 34

Complete the following tasks to unlock PlayStation 3 trophy rewards.

Trophy	How to unlock
...That's A Promise ( Bronze )	Get Tequila to surgery.
Ain't Got Time to Bleed ( Bronze )	Heal or regenerate 30 blocks of health in Survivor.
Alien vs Predator ( Silver )	Create a new species.
Breaking Quarantine ( Bronze )	Escape from the Research Lab.
Breaking and Entering ( Bronze )	Find a way into the Research Lab.
Club Hopper ( Bronze )	Survive The 'Party' at The Club.
Come to Mama ( Bronze )	Liberate the Matriarch.
Elite Sniper ( Bronze )	Kill 10 enemies with head shots from the scoped rifle.
Exit Strategy ( Bronze )	Escape from C-Block.
Extinction Agenda ( Silver )	Destroy the Abomination.
Eyes of the Demon ( Bronze )	Retrieve the ancient mask.
Fallen Comrade ( Bronze )	Find the Youngbloods in the Jungle.
Fortune and Glory ( Bronze )	Find all 45 Predator trophy bells.
Game Over, Man! ( Silver )	Complete all three Campaigns.
Get to The Chopper! ( Silver )	Recover Weyland's datapad.
Grim Reaper ( Bronze )	Harvest all available civilians in the Alien Campaign.
Grunt Hunt ( Bronze )	Wipe out all of the Marines in the Colony.
Gunslinger ( Silver )	Kill 30 enemies with the pistol.
Harsh Language ( Silver )	Discover all 67 Audio Diaries.
I Admire its Purity ( Bronze )	Complete Alien Campaign on Hard difficulty setting.
I LOVE the Corps! ( Silver )	Complete Marine Campaign on Nightmare difficulty setting.
I Like to Keep This Handy ( Bronze )	Kill 2 enemies with one shot with the shotgun.
I Will Never Leave You... ( Bronze )	Locate Tequila.
It Ain't No Man ( Bronze )	Complete Predator Campaign on Hard difficulty setting.
It Uses The Jungle ( Bronze )	Find a way through Getaway.
Killer Instinct ( Bronze )	Win your first Ranked Match in standard Deathmatch mode.
Let's Rock! ( Bronze )	Kill 5 enemies with one burst from the smartgun.
Magnificent, Isn't It? ( Silver )	Complete Alien Campaign on Nightmare difficulty setting.
Matter of Honor ( Bronze )	Discover the Elite Predator's fate.
Not Bad For A Human ( Platinum )	Get all the Aliens vs. Predator trophies.
One Big Bug ( Bronze )	Defeat the Praetorian.
One Ugly Mother ( Silver )	Complete Predator Campaign on Nightmare difficulty setting.
Persecution Complex ( Bronze )	Achieve Persecutor status more then once in any Ranked Match.
Quite A Specimen ( Bronze )	Destroy all 50 Royal Jelly Containers.
Real Nasty Habit ( Gold )	Get 18060 XP in Ranked Matches.
Reclaimer ( Bronze )	Retrieve the second artifact.
Regicide ( Bronze )	Defeat the Matriarch.
Scatter Shot ( Bronze )	As a team, kill 20 enemies in under 60 seconds in a Survivor match..
Serial Killer ( Silver )	Win 10 Ranked Matches in any Deathmatch mode.
Spin Doctor ( Bronze )	Kill two enemies with one throw of the Battle Disc.
Stay Frosty ( Bronze )	Complete Marine Campaign on Hard difficulty setting.
Stick Around ( Bronze )	Kill 20 enemies with the Combi Stick.
The Six Pack ( Silver )	Play with six friends in a Ranked Match.
The Uninfected ( Silver )	Finish a Ranked Infestation match as the only remaining prey.
Under Pressure ( Bronze )	Solve the riddle of the Ruins.
Very Tough Hombre ( Bronze )	Kill 10 enemies in a row without dying in a Ranked Match.
Welcome to The Party ( Silver )	Get 6000 XP in Ranked Matches.
Welcome to The War ( Bronze )	Play and complete your first Ranked Match in standard Deathmatch mode.
World of Hurt ( Bronze )	Survive trial by combat.
You Have My Sympathies ( Bronze )	Help Van Zandt.