Splinter Cell: Chaos Theory Cheats

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All missions:
Hold L + R at the main menu and press X(5), Y(5). You will hear a sound if you have entered the code correctly. All co-op missions will be unlocked. REMEMBER: The same code also works for regular missions. After signing into your profile, on the menu screen hold L + R and press X(5), Y(5).

Movie trailer:
Complete the Lighthouse mission in solo mode.

Keypad codes:

Mission 1: Lighthouse
No keypad locked doors

Mission 2: Cargo Ship
No keypad locked doors

Mission 3: Bank
Keypad to left security booth on first floor: 3624
Keypad to right security booth on first floor: 3624
Keypad to main security room: 2306
Keypad to treasurer's office: 8645
Keypad to bank's back door: 3901
Keypad before president's office: 3490
Keypad to safe in president's office: Code unknown, must be hacked

Mission 4: Penthouse
Keypad To Dvorak Room: 0280

Mission 5: Displace
Keypad to door between meeting room and lobby on second floor: 8136
Keypad to door between meeting room and lobby on first floor: 8136
Keypad to CEO's meeting room: 2346
Keypad to CEO's office: 2609
Keypad to fire escape: 3485
Keypad to central server room: Code 2109
Keypad to R&D server room: 9205

Mission 6: Hokkaido
No keypad locked doors

Mission 7: Battery
Keypad to shipping area: 1879
Keypad to elevator: Code unknown, must be hacked

Mission 8: Seoul
No keypad locked doors

Mission 9: Bathhouse
Keypad to owner's office: 3650

Mission 10: Kokubo Sosho
Keypad To Server Room: 1945

Catching Shetland:
Have your sniper zoomed-in on the guard. When there is a fight, shoot, run, and catch Shetland. Then, end the mission.

Bathhouse: Alternate Shetland Death:
At the end of the level, Shetland and Sam will be on top of a roof with their guns pointed at each other. After a short conversation, Shetland will put his gun away and say "You wouldn't shoot an old friend". You are given a choice, shoot or put your gun away. If you shoot, Shetland will stumble backwards and the intermission sequence for the level's ending will play. However if you put your gun away, Shetland will quickly pull his gun out and point it at Sam. Sam will duck his weapon and stab Shetland in the stomach before throwing him. This will then start the same ending sequence.
User Cheat by Samurai345

Lighthouse: Get rid of the enemy on the top:
To get rid of the enemy on the top of the lighthouse, hang along the edge of the lighthouse. Get underneath him and select the command "Grab NPC". Sam Fisher will grab and throw him off the edge. From here you can watch him scream and fall to his death.

Panama: Never set off alarms:
When you are close to the part with the lasers, go down there and set off one alarm. Kill all the people. When you cross the lasers, you will not set off another alarm. You can now finish the mission without setting the alarms off when crossing the lasers.
User Cheat by Flowing

Seoul: Original Splinter Cell music:
When you begin the level, you are in a child's room. Immediately exit the room and go to the right. When you reach the end of the hall, in which the walls are blown away, turn to the right and enter a half-destroyed room. There should be a radio inside. Turn it on, and it will play the same music from the cafe from where you started near the Chinese Embassy 2 level on the original Splinter Cell.

Ledge grab:
In order to do a better ledge grab, press A, then when the spy puts his legs up on the thing he is hanging from, press Forward while tapping A.

Sneaking:
If you move around with your gun drawn, the noise meter will not move. This is very useful when sneaking up on someone quickly.

Taking lights out silently:
To take out lights silently, first OCP the light, then shoot it instantly.

Alternate dialogue:
When you just see Otomo try to commit suicide, Lambert will radio you and say something. If playing under the normal difficulty setting he will say something similar to "Otomo just tried to commit sepuku. Get in there and revive him". However, if you complete the game under hard difficulty, Sam will say something similar to "Looks like someone feels a bit too good about himself". However, all the objectives will remain the same.

100% rating:
In order to get a 100% rating on any mission, you must complete the level with the following statistics. It is unknown at this time if there is a reward for getting a 100% rating on every mission.

Enemies killed: 0
Civilians killed: 0
Bodies Found: 0
Times Identified as intruder: 0
Alarms sounded: 0