|All Weapons and Infinite Ammo:|
Pause the game and highlight the Weapons menu. Press and hold Right + L2 + R2 + Circle + Square + X
Pause the game. Go into the Options menu. Highlight the Select Mission option. Press and hold Left + L1 + R1 + Select + Square + X
Pause the game and highlight the MAP entry. Press and hold Right, R1, L2, X.
Easier Enemies (PAL version):
Pause the game and highlight the MAP entry. Press and hold Right, L1, R1, R2, Circle, X.
At the title screen press and hold Left, L1, R2, Select, Square, Circle, and X.
Harder Game (PAL version):
Highlight the "New Game" option on the title screen, then hold L1 + L2 + R2 + Square + Circle + X.
Pause the game, select WEAPONS and highlight 9MM. Press and hold Left, R2, Select, L1, Square, and X.
View All Movies:
Go to the movie theater in the first level. Pause the game, highlight MAPS, then press and hold Right, L2, R1, and X.
One hit kills:
Pause game play, highlight the "Silenced 9mm" selection under the "Weapons" option, then press Left + L1 + R2 + Select + Square + X. Gabe will say "Understood" to confirm correct code entry. A single shot anywhere on the body of an enemy with any gun will kill instantly. Repeat the code to disable it. Gabe will say "Damn It" to confirm correct code entry. Note: Pause game play, highlight the "Objectives" option, then press Right + L1 + R1 + R2 + Circle + X in the PAL version of the game.
To get backup, pause and press: Up, Down, Square, Square, Ttriangle and Select. If done correctly you will here "MOVE MOVE MOVE" and 8 or 10 agents will come.
Use the virus scanner to look through walls to see if an enemy is waiting for you.
Shoot With the Viral Scanner:
Go to the first warehouse stage near the end of the game. Then enter the code for all weapons and infinite ammo. Go to the room were you get the Viral Scanner. Kill the guy after he gives you the passwords. Open up the chest with the viral scanner in it. The subtitle should say "Viral Scanner Bullets Found". Now leave the room. You can shoot lights and stuff, but unfortunateley not people.
Grenade launcher in level 1:
Go out the window in the bar into the back alley. Look up and to see two fire escapes. Climb onto the dumpster and get onto the fire escape opposite the bar first, then jump up to the pipes and go hand over hand to the other fire escape. Be careful, because two terrorists will run out to shoot half way across the pipe. After taking care of them, drop down onto the fire escape and open the box for the grenade launcher. This makes the grenade thrower in the subway section much easier to handle.
Getting through the subway:
Go to the opposite end of the subway after it explodes. Use the flashlight on the left of the tracks to find the C-4. Get the C-4, then go to the right hand side. Look up to see the upper level. Press Triangle to climb onto the red crate. Press Triangle to keep climbing up through the debris until the top is reached. This is the only way to exit the lower level.
Find the card keys to get through the gates in the museum. Check all the guards and people that are killed; they usually carry card keys. For the gate in the Rocket Room, shoot the control panel on the third level that keeps sparking while your character is standing on the elevator to reach to that level. The man with the card key is up there.
To open room 1-3, you first have to open the door of the room to the left of the elevator by switching the switch to the right of the elevator. That room contains a computer. Approach the computer and press Triangle. The door to room 1-3 should begin to open. You must kill three terrorists before entering room 1-3. Each has a flak jacket and will throw grenades. Turn right to hide behind the boxes immediately upon entering the room. The terrorists cannot shoot or use grenades because of the boxes. Be careful, as there is an open space between the boxes. Use that space to throw a single gas grenade at the terrorists. Used correctly, the single grenade should kill all three of the terrorists. Wait for the gas to clear, then explore the room. Search the spaces that resemble lockers, and do not forget the flak jackets.
Quickly press Start, then press Start again after catching on fire. You will be hurt, but still alive.
The virus scanner may be used to look through the walls to find enemies.
CBDC agents turn bad:
When playing the first stage of Syphon Filter, wait for a CBDC agent to be killed. Once the CBDC agent is dead, approach the corpse and shoot it in the head a few times. All the CBDC agents will turn against you. Note: You can not kill the CBDC agents without destroying the mission.
Adolph Hitler image:
Move straight ahead n the "Warehouse 76" level after getting to the first checkpoint without getting burned. You will reach a giant metal box with a catwalk over the top of it. Climb onto the box, then onto the catwalk, and run straight ahead. After reaching the end of the catwalk, hop down onto another giant metal box, kill the guard, and look to the right (or where the guard was running when he saw you). A large painting of Adolf Hitler's face can be seen.
Dead Lian Xing still speaks:
In level 10, Base Tower, you hear Lian Xing being taken away by Rhoemer over Gabe's earpiece. Then, when you defeat the helicopter that Rhoemer sends, a FMV sequence will show Gabe jumping off the tower and will reveal that Lian Xing has been killed. Once level 11, Base Escape, starts, shoot the very first fuel tank that appears. Lian Xing will say "Gabe, check your fire! If that fuel tank goes the whole place will go up."
Pit Glitch In Dinorama Stage:
There is a cool glitch you can activate in the museum level (part 2). Go into the room with the model of the T-Rex in it after jump through the glass. Make sure to kill the gaurds, then shoot out all the small lights in the circular pattern above the T-Rex model. After you shoot out ALL the lights, go over to the small podium near the T-Rex' mouth and you'll see that where the floor used to be, it will be all black, i fyou walk into it, you'll fall to your death!! I don't know if you could get the gaurds to fall into the glitch hole, but its worth a try.
Get shot by the CBDC agents:
When there is more than 1 CBDC agents around, let one get killed, when he is lying on the ground dead manually target him and shoot him. The live CBDC agents will start shooting you. watch it, they have very good aim and if you kill them your mission is over.
In the firat level in the subway when you get in, go to your right and kill all the guys. Go into the door farthest back and climb over the boxes, get your flashlight out and a Rocket Launcher (M-79) will be right there.
Extra Multi-Player Levels
There are 10 unlockable multi-player maps:
Unlocked in MISSION 1: COLORADO ROCKIES
To unlock: When you find Chance you will see that he is standing near a waterfall ravine, hang over the edge nearest to where Chance was standing and you will see a cave, drop down into this and collect the H11 inside
Unlocked in MISSION 3: COLORADO INTERSTATE 70
To unlock: At the opening of each tunnel there is a door set into the wall on the left, in the first tunnel, after finding weapons and helping Chance, enter the door and find the Binoculars in one of the rooms
Park Jungle Gym
Unlocked in MISSION 8: C-130 WRECK SITE
To unlock: You must kill Archer with one shot (headshot) as he hangs from the helicopter
Pharcom Incubator Lab
Unlocked in MISSION 9: PHARCOM EXPO CENTER
To unlock: After you have got through the Mars exhibit room, you will go through two doors and find two soldiers looking at and discussing a girly mag, kill them then go to the locker and take the girly mag
note, you cannot actually view the girly mag sorry!
Unlocked in MISSION 11: MOSCOW CLUB 32
To unlock: When the level starts you will be on a walkway above the disco floor, three guards will run into the disco below you, kill them before they start throwing grenades at you
Unlocked in MISSION 12: MOSCOW STREETS
To unlock: At one point when you are chasing Gregorov you will jump into an alley in which two white cars will try and run you over, once you've found out how to avoid them and they have crashed go and collect the PK-102 from one of them
Unlocked in MISSION 13: VOLKOV PARK
To unlock: At the beginning of the level you will be facing the entrance to Volkov Park, at the entrance will be an agent who is shooting at a car, kill him and the hiding guard before they blow up that car, then go to the car and collect the BIZ-2 from it
Unlocked in MISSION 15: ALJIR PRISON (BREAK-IN)
To unlock: Complete the level without using the crossbow at any point
Agency Computer Lab
Unlocked in MISSION 18: AGENCY BIO-LAB (ESCAPE)
To unlock: In the second room of this level there are two air vents, on the left is the one which is the correct exit, the other vent on the far wall from where you enter is the vent you used to get here in the previous level, you must go through this vent and go back to the operating room, climb up onto the viewing balcony and round the corner and collect the M-79 you find here
However, the operating theatre is well guarded with three fully armoured guards who will shoot you up badly, you will probably find it easier to initially take the new airvent on the left, until you find another M-79, then retrace your steps and go back to the second room of the level then make your way to the operating theatre
D.C. City Park
Unlocked in MISSION 19: NEW YORK SLUMS
To unlock: In the burning building you will see a row of washing machines, opposite to the floor which gives way, in one of the washing machines is some dirty laundry which you must collect