You will reach a hallway after you fall out of a vent. There are three rooms in this hallway that require the lockpick to enter. In the third room will be a closet, just like the other ones; however this closet cannot be opened yet. Proceed to the bar, then go on stage and use the microphone. Sam will say something dumb. After he is done, turn around and look behind. A keycard should be somewhere. This keycard opens the previously inaccessible closet. Make your way back to this room and use the keycard to open the closet; the costume is inside the closet.
Bank level: Short sleeved Sam outfit
When you must steal millions of dollars using lockpick, go to the small vault left of the computer. Do the lockpick, and the costume will fall out.
Battery level: Snow Guard outfit
First, find the wrench in the bathroom. The costume is in the room that is shaped like a "U", and has two cameras and four lasers. There is a keycard room in there. Once you enter the keycard room, in the right corner is a guard standing in the dark. Take him out and climb on the crate. Then, turn towards the next crate and select the option "Bash Door". The costume will be in there.
Cameras
If you are on a mission where you cannot kill someone (for example, Manhattan Streets) take out your rifle from your back and equip it with a camera. Then, zoom in on a person's head. Shoot them with the camera. Make sure that it is the head or it will not knock the person out.
Camouflage Sam costume in Lighthouse level
Finish sniping the man on the roof, then before you rappel down off the platform, stay on the platform. In the high right corner is the costume.
Completion bonuses
Successfully complete the game to unlock infinite ammunition, infinite items, and additional character skins.
Costumes
Note: To equip an extra costume, go to the options screen, select "Extra", then tap "Enable Outfit.
Displace
On the Displace level where you can kill two men, one resets all alarms, but the other man sets them back to whatever number they were. The first is in the room with the computer and books on the desk. It is near the boiler room. Knock him out first and shoot him with the 5-7 pistol. The next man is in the room after you get out of the vent shaft. You can kill any enemy on a no killing mission if you do it this way. The third person that does something on this level is the one guarding Milan's office. He leaves blood stains resembling a gun. Note: These only work if you wear the National Guard costume, found on the ledge in Manhattan. The ones featuring alarms (the first and second men) only work on a random basis.
Displace Mercenary costume in Display level
Go to floor 3. To learn what door has the costume, look through the optic cable. Once you see the green package, enter the room; the keypad lock code to the door is "5800".
Displace suit
The Displace suit is in the room next to the room where you have your last chance to save; the code is "5800". There are a total of nine suits.
Display level: Displace Mercenary outfit
Go to floor 3. To learn what door has the costume, look through the optic cable. Once you see the green package you will have to enter the room. The keypad lock code to this door is "5800".
Lighthouse level: Easy guard kills
When you cut the power and the guard is still alive, he will come to turn the power back on. Run past him as he comes through the doorway. He will say " Is someone there?". Run through the room. When you come back, you will find out that the lights are off and the guard is gone. He is around the corner. Take out your rifle and kill him. With most guards, when they say "Is someone there?", they stand perfectly still and you can shoot them easily.
Lighthouse level: Pipes
Find a man underneath one of the poles that you can climb. Climb onto the pole and hook your legs up by pressing X. Make sure that your head is pointing towards the man. Then, climb towards him. If done correctly, the interaction box should appear with the "Break Neck hit Y" message. Sam will hang down from his knees and break the man's neck. If this does not work, you can drop behind the man and grab him. Also, when you are hanging from a pipe with your legs down, press R and you will draw your 5-7 pistol. If you want to break someone's neck from a pole and they are walking about, put your legs down and draw your pistol. Then, shoot just ahead of them. They will say something like "Is someone there" and come towards you. Put your pistol away and quickly press X. Note: You may have to press X twice. Wait for the man to walk underneath and you can break his neck.
Masked Sam costume in Penthouse level
Go to Zherkezhi's apartment and make your way to the first room on the top floor. Take out the guard and go to the long dark hallway at the top left of the room. There is a keypad lock to get in; the keypad code is "5698".
National Guard costume in Manhattan Streets level
Go to the open area just before you enter the penthouse. Kill the two guards and climb the pipe at one of the ends of the area. From there, go left and jump down to the next platform. The costume should be somewhere around the corner.
Shadownet Agent costume in Kokubo Sosho level
Once you go down to the elevator shaft Sam will consider the Descent to Hell. There will be lasers at the bottom. Once you are down there find a ladder to get back up. Once you climb it, you will end up in a small room with lasers. The costume is somewhere in the back corner.
Short sleeved Sam costume in Bank level
When you must steal millions of dollars by using the lockpick, go to the small vault left of the computer. Use the lockpick, and the costume will fall out.
Snow Guard costume in Battery level
Find the wrench in the bathroom. The costume is in the room that is shaped like a "U", and has two cameras and four lasers. There is a keycard room in there. Once you enter the keycard room, in the right corner is a guard standing in the dark. Take him out and climb on the crate. Then, turn towards the next crate and select the option "Bash Door"; the costume will be in there.
Thermal Suit costume in Hokkaido level
Before you try to find the costume, locate the wrench that is laying on the ground. Then, proceed through the level until you reach the man who is shooting from the top of the building. Once you kill him, get to where he was. Then, run across the rooftop to the vent. Exit the room you fall into. If done correctly, the icon "Bash Door" should appear in the top left corner of the room. Bash the door and the costume will be in there.
