Dancing Agent 47 in The Murder Of Crows mission  -  Get one of the disguises for the Salsa, Rock, or Blues bar. Then, move Agent 47 on the dance floor and allow the game to idle. After a few minutes, he will begin to dance. Note: If you move him around while he is dancing, he will stop; however, you can still move the camera around while he dancing.

Easy "Silent Assassin" rank in A New Life mission  -  Start the mission with no weapons except for your standard equipment. First, go to the back of the food truck when the delivery man is walking off. Pick up the donuts, then take them around the corner so that nobody can see you. Put them on the floor and then scroll through your inventory. Select the "Sedative Syringe", then look down at the donut box and inject the sedative into them. Pick up the donuts again, put the syringe away, then go back to the food truck. Drop the box of donuts on the floor directly behind it, then walk away. The delivery man will pick up the donuts and take them to the FBI van across the road. Wait a short time and an short intermission sequence inside the truck will appear, showing the FBI agents falling asleep. Go to the back of the truck, open the door when prompted, and go inside. When inside the FBI truck, suit up as an FBI agent, and steal the video tape, which should be on the left side of the van as you go in. Do not pick up any weapons. Leave the vehicle and go up to the front of the house and walk inside. Go out the back towards the shed, which is in the top right hand corner. Wait until there is nobody around. If the pool man goes in, do not try to follow him or your suspicion bar will go into the yellow. When there is nobody around, pick the lock, go inside, and pick up the lighter fluid. Exit the shed, go right, and then go towards the pool. Over to your right is a barbecue. Go up to it and you will get the "Rig the Barbeque" option. Select it, then go inside the house and wait under the stairs. Stand around for a short time and a short intermission sequence will show a woman being burned alive. When she is dead, go back outside and pick up the microfilm that she is wearing around her neck. Go back inside, then go up the stairs. Turn right across the landing, then go straight. Open the first door on your right, then go in and wait behind the L-shaped wall. If the main target is already there, wait for him to leave, then wait awhile for him to return. When he returns, make sure he has his back towards you, then fibrewire him. When he dies, drag his body to the place you were hiding (the L-shaped wall). Then, sprint out of the house towards your escape as quickly as possible. If done in a short time, you should get either a "Hitman" rating or "Silent Assassin" rank. Either way, you will get $100,000 and if you have already completed the game you can purchase an additional upgrade to your custom weapons whenever you select a mission.

Easy "Silent Assassin" rank in A Vintage Year mission  -  You do not need any weapons for this mission; you only need the Anti Personnel Mine, Sedative Serum, and Coins. At the start of the mission, do not follow the tourists. Instead, go west along the outer wall. When you get to the corner you will see a broken truck. Check your map for guards. There should be one south of your location. Go around him using trees and bushes as your cover. You do not need to crawl, as he usually does not notice if you are a fair distance away. Once you pass him use the serum and sedate him from the back. Take his clothes and leave him there. Get in the rear compartment of the broken truck then get on its roof. From there, get on the storage room roof. Slowly crawl through there to the hole in the roof then jump in. The other guards will not pay much attention to you since you are wearing the guard's clothes. You do not need to worry about the alert level, even if it rises. Run out of the storage facility and across the square. Go to the right from the mansion and through the wooden door. Keep running straight and take the first door to the left that leads to the basement. You should see a guard as soon as you open the door. Place a mine next to him on the gadget with rope. Check the map until you notice a red blip (the target) enter a small square opening below you. As soon as this happens, get a few yards back from the explosive. Throw a coin on the ground so the guard comes to it. Detonate the mine once guard clears off. By doing this, the guard will not die and you will not suffer a penalty for an unnecessary kill. Wait for some guards to run to the place you are at, then make your way back to the mansion. Instead of the front entrance, use the small door on the left of it. This will lead you just a bit underground. Go to the door on the right and wait (with your map on) for the guard who is parallel to you to come by and turn around (starts marching back). Open the door, go to him and sedate him. Drag the guard to the nearest room to your right and take his clothes. He is a different type of guard who can move around the house freely. Dressed as a VIP guard, go to second floor and into the room with your target. Do not bother to crawl. Go to the balcony and throw a few coins on the ground to get his attention. Once he comes to check it out, get behind him and push him over the rail. Both targets are now dead. Check your map. There should be a "!" mark nearby, which is a window. Get out of it and down the roof. Get off the roof and go right behind the corner. There will be a narrow passageway down to the plane. Notice this is the place where the second target has landed. Do not forget to pick up his weapon on your way down. When you are near the plane, crawl by the one worker and two guards that are nearby. Ignore the worker and walk around the path. Get into the plane and complete the mission.

Free intel  -  Purchase all the intel when a mission starts. Make a note of it, then pause the game and choose to restart the mission. You will have your original starting money, and the intel will now be available for purchase again even though you know what it contained.

Keep custom weapons in Amendment XXV mission  -  There are two methods to take weapons such as the Silverballers, etc. through the White House and bypass the metal detectors. The first method is to go to the other end of the parking lot when you start. Look to the left when you get to the end and you should see a ICA storage box. Put your custom weapons in it, then go into the White House through the double doors at the front and walk through the metal detectors. Remember that fibre wire, syringes, mines, and the detonator will not activate metal detectors. Go to the other end of the lobby. There should be a guard behind a rope watching some double doors. Go into the door on his left (the toilet), and stand facing the corner furthest away from the door and the toilet. Wait for the museum member or staff to walk in and for the door to shut behind him. Take out a silent weapon (fibre wire or syringe) and use it on him before he opens the door. Take his clothes and hide him as best as possible against the corner furthest from the toilet, but closest to the door. Check the map. If there is an innocent person in the lobby looking in your direction, wait for him to start walking away before opening the door or he will see the body and you will be shot. Open the door when you get the chance. While staying behind the ropes, walk across the width of the lobby and through the door on the other side. Go directly to the other end of the next corridor and take the last door on the left. This should lead you outside. When you get the chance to take out the U.S. Marine who patrols here, do so then hide him behind the big steel block. Take his clothes and gun. Walk back out the front doors and you should beep when going through the scanner, but the guards will not shoot you. Take your weapons out of the storage box from the side of the building and conceal them. When you go back in you should beep, but once again the guards should ignore it as long as you have your M14 at the ready.

For the second method, do the same as above, but when the Marine is out of the way, do not take his clothes or his gun. Work your way back out the front doors and go to the storage box. Take out a weapon and hold the weapon so you can throw it. Aim up and past the fence, towards the White House wall. Bounce your weapon off the wall and it will land on the other side of the fence. Do this with all your weapons, then go back to the area where you incapacitated the Marine. Walk down the alley and pick up your guns, then conceal them. Make sure you are far enough behind the wall for the guards out the front not to see you or they will shoot at you. Note: This method is useful if the game glitches and the Marines shoot at you even when you look like one.

Newspaper headlines  -  After completing a mission, the newspaper headline will vary depending on how you did. If you did poorly, the paper will say so in the paragraph. If you shoot very little and use mostly hand to hand it will say that there is not enough information to make a ranked description of you. If you completed the mission with high accuracy, it will state that you are a well trained marksman. Try completing missions differently to see different headlines.

Weapons

Pistols
Bull.480
Desert Eagle
Silverballer
Slp.40 Pistol
Snub Nosed
Six Shooter
Slp.40s

Shotguns
Shotgun
SP12 Shotgun

SMGs
MP5
MP7
MP9
SAF SMG
SMG tactical
TMP

Rifles
Air Rifle
FN-2000
M4
M14
SG552

Sniper rifles
Dragunov
Elephant Rifle
Kazo Trg
W2000 Sniper

No hideout weapons
Nailer

Upgrades
M4

Ris handguard ($50,000)
Low velocity ammo ($50,000)
Butt stock ($50,000)
Extra ammo ($75,000)
Laser sight ($75,000)
Rail mount ($75,000)
Armor piercing bullets ($75,000)
Silencer type 1 ($100,000)
Pistol grip ($100,000)
Double clip ($150,000)
Red dot sight ($150,000)
Silencer type 2 ($200,000)
Drum magazine ($200,000)
Scope type 1 ($200,000)

Silverballer

Low velocity ammo ($50,000)
Silencer type 1 ($50,000)
Extra ammo ($75,000)
Laser sight ($75,000)
Rail mount ($75,000)
Magnum ammo ($100,000)
Dual action ($100,000)
Long slide ($100,000)
Red dot sight ($150,000)
Large clip ($150,000)
Silencer type 2 ($200,000)
Full auto fire ($200,000)
Scope type 1 ($200,000)

SMG Tactical

Butt stock ($50,000)
Low velocity ammo ($50,000)
Extra ammo ($75,000)
Rail mount ($75,000)
Magnum ammo ($75,000)
Rapid fire ($100,000)
Short barrel ($100,000)
Silencertype 1 ($100,000)
Laser sight ($150,000)
Double clip ($150,000)
Silencer type 2 ($200,000)
Red dot sight ($200,000)

SP12 Shotgun

Butt stock ($50,000)
Flechette ammo ($50,000)
Extra ammo ($75,000)
Reload boost ($75,000)
12 gauge slugs ($75,000)
Short barrel ($100,000)
Rail mount ($100,000)
Laser sight ($150,000)
Bigger magazine ($150,000)
Red dot sight ($200,000)
Silencer type1 ($200,000)

Misc. upgrades

Pain killers ($50,000)
7x50 zoom binoculars ($50,000)
Improved lockpick ($50,000)
Kevlar vest ($75,000)
Enhanced detonator ($75,000)
Adrenaline ($100,000)
Flak vest ($100,000)
Extra mine ($100,000)
Cratt Schultz lockpick ($150,000)
Foil padded suitcase ($150,000)
Flexible flak vest ($200,000)

Action Replay Codes

(M)
TDYX-XYJ9-WD8XT
36C7-17N9-9U24W

Infinite Saves
6PDW-PEFP-2KT8V
4BJ9-4EKF-9RGWW

Never Reload
NKH9-4NBB-5478B
EB7F-MVAN-1Y230

Infinite Ammo
6MNT-13TK-4ETTE
UK4C-B9K3-4UEE7

Infinite Cash
V0GE-HQ2M-CM6HE
18ZE-6MJE-XYB5H

Infinite Health
EPUD-93D1-9NC7R
N18M-5UXF-27XJX

Enable All Levels-Rookie
707Z-N6QU-7181N
YYPF-VHV1-YA458

Enable All Levels-Normal
66XR-H6BC-JX6NQ
1P5B-DHD3-HRY10

Enable All Levels-Expert
G9KN-UZBP-VWHHC
Z32V-RX4B-68NGB

Enable All Levels-Pro
0MG6-K5WF-CB0JM
PP2U-F7HM-AXUA5

All Weapons-Rookie
0K4B-TZF0-53R16
V549-GW9V-H9MVB
8KB9-HCVB-88N4Q
HBMB-X664-PJJC5
YJ6K-UWCB-QHC1G
0PDK-X694-M8DTT
F548-GQ4W-C0A1Y
UNTK-Y3AT-Q2RC9
2MNJ-CKHU-Q2XG5
CDGT-F2KJ-WBM2R

All Weapons-Normal
J7QQ-RK8Z-8CZRQ
K4VM-6XRB-640QA
ZAHE-HTNR-VJ04U
HBMB-X664-PJJC5
P6JT-AFG1-B1XXY
0PDK-X694-M8DTT
A5RA-4QCV-ENETK
UNTK-Y3AT-Q2RC9
TDR9-3F5C-XUXJU
CDGT-F2KJ-WBM2R

All Weapons-Expert
7R63-2MUD-5TYQD
Z78U-ZX12-YCNYV
72WE-J9H5-J3UYK
HBMB-X664-PJJC5
Y9K2-EMAB-820JJ
0PDK-X694-M8DTT
0ARM-WN5H-CJWJK
UNTK-Y3AT-Q2RC9
42K3-VV1F-5RUU6
CDGT-F2KJ-WBM2R

All Weapons-Pro
BCKW-CU7R-U1TG7
0VNU-XYNV-GMY0H
6VR6-W0RH-587YZ
HBMB-X664-PJJC5
D0Z9-NPHU-R09WV
0PDK-X694-M8DTT
ZQ8T-R1HA-9EZAH
UNTK-Y3AT-Q2RC9
N51T-FXGE-DN31F
CDGT-F2KJ-WBM2R