Richard (Chicken): No Bonus
Start the game with this one

Rasmus (Owl): An Eye For Secrets - Puzze Pieces become more visible
Given for completing The Metro (Predule)

Tony (Tiger): Fists of Fury - You can kill people with your punches and all your executions will oneshot enemies
Given for completing No Talk (Chapter 1)

Aubrey (Pig): More Guns
Given for completing Overdose (Chapter 2)

Don Juan (Horse): Lethal Doors
Given for completing Decadence (Chapter 3)

Graham (Rabbit): Walk Fast
Given for completing Tension (Chapter 4)

Dennis (Wolf): Start with Knife
Given for completing Full House (Chapter 5)

George (Giraffe): Look Further
Given for completing Clean Hit (Chapter 6)

Ted (Dog): Dogs Don't Attack - If you are having problems with dogs, this masks will make it easier. You still have to kill them tho.
Given for completing Neighbors (Chapter 7)

Rufus (Elephant): Survive One Bullet - Completely useless because enemies like to fire many bullets at you.
Given for completing Push It (Chapter 8)

Rami (Camel): Extra Ammo
Given for completing Crackdown (Chapter 9)

Willem (Monkey): Rip And Steal - If you run at enemy, you can press Space to execute them while they are standing, with this mask you'll also take their weapon when you do it.
Given for completing Hot&Heavy (Chapter 10)

Peter (Unicorn): Quiet Gunshots - Makes part of the game very easy because you can use guns without alerting whole level.
Given for completing Deadline (Chapter 11)

Zack (Frog): Longer Combo Window
Given for completing Assault (Chapter 13)

Oscar (Mole): Darkness - Appear to affect only you? Effectively makes game harder since you can't see.
Given for completing Vengeance (Chapter 14)

Rick (Fox): Good Shot
Given for completing Safehouse (Chapter 16)

Brandon (Panther): Walk Faster
Given for completing Fun&Games (Chapter 17)

Charlie (Octopus): More Melee Weapons
Top left corner of the level, on the counter in the kitchen area of Safehouse (Chapter 16)

Louie (Chameleon): Hard To Spot
Given for completing the game with normal ending

Phil (Fish): French Translation
Laying on top of a box in sewers with Janitors in Resolution (Chapter 19)

Nigel (Bat): Reversed Controls
Finish the game by solving the puzzle and discovering the alternative ending

Earl (Walrus): Survive Two Bullets
On a corpse in Overdose (Chapter 2)

Jones (Alligator): More Gore
In Full House (Chapter 5) after you finish the level and exit the house, do not enter the car but instead walk around the house to a sewer grate. You need a crowbar to open the grate so remember to take one from the house, there's always one laying on the ground at the start of the level so if you use it, make note of where you leave it and take it with you.

Carl (Grasshopper): Start With Drill
On the body in the disco room in Push It (Chapter 8), right as you enter the level

Jake (Snake): Killing Throws - All your thrown weapons kill on hit, very good mask
On a body in Hot&Heavy (Chapter 10)

Richter (Rat): Start With Silenced Uzi
Found in the Assault (Chapter 13), upper right corner of the level with the police chief and the prisoner, on the table


To pick up a mask, you can't have anything in your hands. If you still can't pick up a mask, finish the level and return to the mask when all enemies are dead.

Wearing the Owl makes makes the pieces easier to spot but even if you aren't wearing it, the pieces are not too difficult to spot if you know what you are looking for. They are purple pixels.

The Metro (Predule) "U": Bottom left corner of the first floor, next to tracks.
No Talk (Chapter 1) "T": Top left corner of the second floor, in the kitchen
Overdose (Chapter 2) "A": Bottom right corner of the second floor, in the bathroom next to toiler
Decadence (Chapter 3) "O": Bottom left corner of the second floor, in the dining room. This can be a bit hard to spot because it's a purple pixel on purple mat but it's on top right of the mat, close to a chair.
Tension (Chapter 4) "A": Left side of the second floor, in the bomb room close to the window.
Full House (Chapter 5) "E": Bottom right of the first floor, in the kitchen area, right of the chairs.
Clean Hit (Chapter 6) "I": Bottom right of the second floor, on the balcony, close to the second bush from top.
Neighbors (Chapter 7) "N": Top left corner of the first floor, in the bed room, next to the table.
Push It (Chapter 8) "R": Top right corner of the rightmost second floor, in the disco room. Can be a bit pain to spot because the floor flashes.
Crackdown (Chapter 9) "S": Top middle of the second floor, right next to the elevator from which the Swat enters from. You need to get there FAST before police arrives so don't bother circling the map, just cut a path straight there.
Hot&Heavy (Chapter 10) "I": The floor which entrance is the top right door from the base map, bottom left room with deck chairs and pool in it, next to a chair.
Deadline (Chapter 11) "N": Bottom left of the second floor, in the dark room, below the desk next to wall.
Trauma (Chapter 12) "W": Bottom right of the floor you wake on, in the bathroom next to invatoilet.
Assault (Chapter 13) "S": Bottom left corner of the first floor, in the bathroom, next to toilet.
Vengeance (Chapter 14) "B": In the bathroom of third floor that you see right as you come up the stairs, top left next urinals.
Showdown (Final Chapter) "H": Left side of the first floor, between the sofa and the chair next to wall.

Hit Esc when ingame to get to Puzzle, once you have all the pieces you can arrange them to spell a sentence "IWASBORNINTHEUSA". This allows you to use the computer in the last chapter before entering the sewers, thus unlocking the secret ending.