Biathlon mini-game mode - On the first mission at Room 413 snipe all your enemies with the air taser, Gabe will say ''got it'' when you finish all your enemies.

Big Boom 2 - When you are in the second level (the one where you are in the jungle), when you pick up the plant sample transport kits, you continue through that tent to the end and there is a doorway, continue through that to the temple, climb up the temple to get a M-79!

Colorado Bridge Arena in Mini Games - Play through Pugari Complex while refraining from killing Foreman Jones. Lawrence will not say ''got it'' at the end of the mission.

Defeating Mara Aramov - To defeat Mara Aramov on the train, get the AU300 out of the crate before you blow open the door with the explosives. Next, climb up on the train itself. Finally, walk forward so that you are near the beginning of the train. Aim through the train past the bullet proof glass and let Aramov have it with your new X-ray.

Explosives - There are a lot of weapons in Syphon Filter 3. I am going to give you the location of two guns that are dangerous to use in close quarters. The first place is the Pugari Complex.When you head up one of the hills, on your right there is a ledge with boxes. Get on the ledge and go back the way you came. You will see a box containing an M79. The other place is the waterfront before you meet Russel and Magie in the warehouse. Go right and shoot the barrels .(Take no risks. Lots of guys are around.) You will see a box. This box contains the MIL15 Shotgun. Near one of the trucks will be two boxes. One has a flak jacket and the other contains a SPYDER. Have fun! 

Easy kill - At the very end of the game, when you go to beat Myra Amarov (sp?) on the subway train, make sure you have this gun called Audi 3000. The Audi 3000 can shoot through any surface except for bulletproof glass. You'll find this gun in a box before you see Amarov. Anyways, after you get the gun, you'll keep running and bomb open this door. Amarov will be there w/ a hostage. She's hiding behind bulletproof glass so don't bother shooting. However, on the roof of the train, there's a opening. Climb up this opening and you'll be right above Aramov. Aim the audi 3000 and you should see through the roof of the train and be able to aim at Amarov's head. You'll get a nice clean shot. It's the easiest kill you'll get in the whole game. 

End Level Option - Beat the game to unlock the "End Level" option. This allows you to end the mission or level you are currently on.

Find the Big Boom - When parachuting in as Lawrence Mujari before you land immediately reverse direction and land on the high ledge in back of the crane. Shoot the guard and get the M-79 out of the crate. 

Kabul, Afganistan in 2 Player - Play Kabul, Afganistan and first kill all seven snipers without being seen at all, that means you will never see your danger bar. The catch is that you cannot get the au300 weapon before you kill all seven snipers. Lian will say ''got it''.

Level select - Successfully complete the game under the hard difficulty setting to unlock the "Level Select" option.

Mini Game Aerna : Military Base - On the first mission (Hotel Fukashima) at Room 413 snipe all your enemies around the guy that is getting hit by all the other men this man also has a different coat (its purple) well just save him by killing the the men that are around him and in the same room, then he will run out the room and Gabe will say ''GOT IT''.

Nigel Cummings - At the Waterfront level, make sure you take the MIL15 (to the right of warehouse Maggie is in). Save at least three shots for the next level. When you receive the order to kill Cummings, take out the MIL15 and aim for the ground immediately beside him. If you kill him, you will see the body in front of the truck.

Pharcom Warehouses Mini-game Arena - Beat Level 9 (Waterfront) in less than 2 minutes.

Playing in hard difficulty - Go to title screen, highlight ''New Game'' then press: Up+Select+L1+R2+Square+Circle+X at the same time. You will hear a tone. Then highlight ''One Player'' and press: Up+Select+L1+R2+Square+Circle+X at the same time.

Rhoemer's Computer Center Arena - Play through C-5 Galaxy Transport without killing the co-pilot. Gabe will say ''Got it'' at the end of the mission.

Rhoemer's Fortress - Beat Level 14(the 2nd Australian level) without being seen.

Rhoemers Labs Two Player Arena - On the Costa Rican Plantation, (Level 2) to get ''Rhoemers Labs'', you will see a Female Slave being beaten by a guard. Kill him, and she will ask you to save her friend, do so, and you will get the Labs after completing the Level.

Select Level and End Level cheats - Complete ''One Player'' mode on normal difficulty (no inputting ''Hard Difficulty'' cheat code) to unlock Select Level and End Level cheats in the ''Cheats'' menu. With Select Level, you can select any missions to play at any time and with the End Level cheat, you can instantly end a mission with success.

SS.Lorelei two player arena - Play SS. Lorelei Mission, finish the mission without killing the Engineer, and the guy in the white uniform, he will surrender to you, dont shoot him.

Super Agent Mode - Beat the game to unlock Super Agent mode. Start a new game. Pause the game and enter the options screen. Enable the "Super Agent" option to make all shots one-hit kills. 

Triple Whammy - If you did not get the AUG300 sniper rifle you can throw a grenade in the train engine. It will kill Mara and the hostage but will unlock Super Agent, Select Level and End Level, which you can use to finish the game from there. 

Tear Gas Trick - In one of the levels there will be a tear gas launcher. When you get this go to the closest wall and fire it once. Then go to your weapons screen and choose a weapon of your choice. When you exit out of the screen you will still have the gas launcher but firing the weapon you chose.

Unlock MIL15 On The First Level - When you get ready to snipe Shi Hoa and the guard beating the prisoner in the building across the street, kill Shi Hoa, the guard, and the guy in the next room before they kill the prisoner. He will escape. After you kill everyone else in the building and move on to the lower level of the building, you can find the prisoner you saved by taking a right turn when you go up some stairs. There will be a hall. On the right side of that hall will be a door you can open. When you open it, the prisoner will be standing there. After Gabe yells at him, the prisoner will give you the MIL15 and run away. 

Unlock Multiplayer Jungle Map - To unlock the Jungle for multiplayer, you have to free the two women in the Jungle Level. 

Gameshark Codes

All Missions Open 8014f9c40013 
Extra Weapons 1 Press Select+X for extra weapons d012622ebffe   8012d7d8fffe   d012622ebffe  8012d7da0000   d012622ebffe   8012d7dc0000 
Extra Weapons 2 Press Select+Square for extra weapons   d012622e7ffe   8012d7d80000   d012622e7ffe   8012d7daf900   d012622e7ffe   8012d7dc005f 
Extra Weapons 3 Press Select+Circle for extra weapons   d012622edffe   8012d7d80000   d012622edffe   8012d7da00ff   d012622edffe   8012d7dc0000 
Infinite .45 Handgun Ammo 8012d7ec0063   8012d7ee0063 
Infinite 12 Gauge Shotgun Ammo 8012d8220063 
Infinite 9mm Ammo 8012d7e60063 
Infinite AU300 Ammo 8012d8100063   8012d8120063 
Infinite Biz-2 Machine Pistol Ammo 8012d8080063   8012d80a0063 
Infinite C4 Explosives 8012d8660063 
Infinite Crossbow with Laser Ammo 8012d8500063   8012d8520063 
Infinite Falcon Ammo 8012d7f00063   8012d7f20063 
Infinite G-18 Machine Pistol Ammo 8012d7f40063   8012d7f60063 
Infinite Gas Grenade Ammo 8012d8620063 
Infinite Grenade Ammo 8012d85e0063 
Infinite H11 Sniper Rifle Ammo 8012d80c0063   8012d80e0063 
Infinite HK-5 Machine Pistol Ammo 8012d7f80063   8012d7fa0063 
Infinite K3G4 Assault Rifle Ammo 8012d81c0063   8012d81e0063 
Infinite M-16 Assault Rifle Ammo 8012d8040063   8012d8060063 
Infinite M-79 Grenade Launcher Ammo 8012d8400063   8012d8420063 
Infinite MIL-15 Shotgun Ammo 8012d8280063   8012d82a0063 
Infinite Maks Shotgun Ammo 8012d82c0063   8012d82e0063 
Infinite Mars Sub Machine Gun Ammo 8012d8140063   8012d8160063 
Infinite Nightvision Rifle Ammo 8012d8380063   8012d83a0063 
Infinite PK-102 Assault Rifle Ammo 8012d8000063   8012d8020063 
Infinite Silenced 9mm Ammo 8012d7e80063   8012d7ea0063 
Infinite Silenced HK-5 Machine Pistol Ammo 8012d7fc0063   8012d7fe0063 
Infinite Silenced Sniper Rifle Ammo 8012d8340063   8012d8360063 
Infinite Sniper Rifle Ammo 8012d8300063   8012d8320063 
Infinite Spyder Skorpian Ammo 8012d8180063   8012d81a0063 
Infinite Tear Gas Launcher Ammo 8012d84c0063   8012d84e0063 
Infinite UAS-12 Rapid Fire Shotgun Ammo 8012d8240063   8012d8260063 

Unlock Cheats When in a game press start and go to Options, the last selection in the Options will be Cheats. 801223f4ff07