Splinter Cell Double Agent

Elite mode:
Successfully complete Solo mode.

Hint: Alternate endings:
Complete the indicated task during the final mission to see the corresponding ending after the bomb is disarmed.
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Ending A (Good): Disarm both bombs before they are shipped out.

Ending B (Normal): Disarm only one bomb. Note: depending on which bomb you defuse (on the roof or on the docks), there will be two different Normal endings.

Ending C (Bad): Do not disarm either bomb.

Hint: Bonus equipment:
Complete the following special objectives in single player mode to unlock the corresponding item.

Electric Lock Pick: Primary objectives in JBA HQ 1.

EMP Device - Enhanced: Primary objectives in JBA HQ 1.

EMP Grenade: Secondary objectives in the Iceland Assignment.

EMP Grenade - Attachment: Secondary objectives in the Cozumel Assignment.

Explosive Sticky Camera-Attachment: Secondary objectives in the Iceland Assignment.

Frag Grenade - Attachment: Primary objectives in JBA HQ 3.

Gas Grenade: Primary objectives in JBA HQ 1.

Gas Grenade - Attachment: Secondary objectives in the Cozumel Assignment.

Hacking Device - Force Hack Upgrade: Primary objectives in JBA HQ 2.

Hacking Device - Software Upgrade: Secondary objectives in the Shanghai Assignment.

Night Vision - Enhanced: Primary objectives in JBA HQ 3.

Shotgun Shell - Attachment: Secondary objectives in the Okhotsk Assignment.

Smoke Grenade - Attachment: Secondary objectives in the Shanghai Assignment.

Sonic Grenade - Attachment: Primary objectives in JBA HQ 2.

Ultrasonic emitter: Secondary objectives in the Ellsworth Assignment.

Wall Mine - Flash: Secondary objectives in the Okhotsk Assignment.

Wall Mine-stun: Secondary objectives in the Ellsworth Assignment.

Hint: Ellsworth Penitentiary: Get back to cell:
When you sneak out of your cell by crawling under the bed and getting the walkie-talkie, you must get back under the time limit. When you are up on the grating, instead of taking the pipe down drop off. You will knock out a guard. Then, go back to your cell and act normal. The grating is the only way down.

Hint: Okhotsk, Russia Part 2: Bomb defusing:
In Mission 6: Okhotsk, Russia Part 2, after the talk with the Captain he reveals that he has rigged the bombs to go off. Emile Dufraisne tells you that they are in the machine room. Look for a crawl space near you. Go through it and down the ladder. Once you are in the machine room, disrupt the light near to the ladder with your OPC and the camera that you will find nearby. Then, go to the first bomb (you will recognize them by a green light) on the same level as you are on. You can defuse them by cutting the wires in a particular order. The wire you have selected for cutting will be highlighted in green You will know which wire to cut by a short vibration in the controller. When you select the wire the Captain will tell you now have three minutes. The rest of the bombs are located on the machine towers (two of them) and one is upstairs roughly opposite the first bomb. Note: There are three guards in the room. It is recommended to quick save the game before attempting to defuse your first bomb so that you have an idea of how it is done.
The Godfather.

Hint: Disposing Hisham's body:
If you are going to kill Hisham, wait until he is down in the parking space. Kill him and pick up his body. Walk to the back of the red car and put him in the back. Press Place Charge and stand back. Detonate it and the "Opportunity Objective complete - Dispose of Hisham's body" will appear.

Hint: Defeating Emile:
Make sure you have a flash and a frag grenade and full life. There are a lifebox near the door outside of Emile on the right wall. Go outside to Emile and an intermission sequence begins. When it is done, on your left may be a laser beam. Wait for it to go off. When the laser goes off and Emile is done shooting (he will begin again), roll to the next chair or bench. Wait until he is finished shooting again. Continue doing this and go up for the fence/rail. Jump onto it. Go down from it and you now must take Emile out. Walk away for one or two seconds, and make sure you can drop the flash grenade near Emile. Shortly after it is dropped, put your frag grenade in the same place. Emile will not see you drop it and will be defeated. Then, read the computer and defuse the bomb. Note: Take your time.
Oliver Weber.

Hint: Bypassing lasers:
Whenever there are laser beams in your way and you have no EMP ammo or you do not want to use the OCP on your pistol, pick up a knocked out or dead guard. You can use him as an unlimited laser pass.
Achillies.

Glitch: Kill Moss on the JBA 1 mission:
When you start, you will not be able to use your night vision goggles very well. Go into the large garage area. If you are in the correct one, there will be some stairs leading to a camera above the doorway. Also, there is a turret by the stairs at the bottom. Disable the light with your gun by pressing L. Then, quickly hack the turret and disable the IFF icon so that it will shoot JBA members as well as yourself. Next, run back to the dark as the light comes on. Moss is patrolling upstairs. Grab him. Moss wears a green vest and strange trousers. He will say angry things to you if you interrogate him. Bring him downstairs without knocking him out then move him in front of the turret. It will kill Moss. Lambert will get mad and say that the mission is over. Note: Sam does not have any knives in this mission, and this may require a few attempts. Also, you can just smash the light.