Splinter Cell: Nijuu Spy in

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.

On the last mission make sure you did not let Emile kill Enrica earlier. On this mission you must go down a elevator to stop the bomb, but before you meet Enrica who opens the door for you. When she does that she will start walking off. Follow her, then kill her in the first room you come to on the left. This room is Enrica's. Go inside carrying her body and drop it by pressing Y on the sofa next to the bed. If it did not land on the sofa and stays there, keep trying. Then, jump up on the sofa or find a way onto it and pick up her body. Walk over on to her bed and press A to lay her body down. Her body will past through the bed.

As a Mercenary in multi-player, go to the ammo crate with a full set of grenades. Hold A and launch three grenades. Release A and you automatically have three more grenades (and drones if you did not have any to start with).

Wait after the credits on any kind of ending, or complete the game with the best or worst ending.

In story mode, always be patient when the guard come. Never rush to him. Let him go to you and sneak at him and grab him.

On the last mission when you choose to shoot Jamie or Lambert, shoot Jamie. Open the door and move Jamie's body in between it. Have half of his body in the room and the other part outside it. Face his body so that his upper half is sticking outside. Then, run outside and hide in the dark. Watch his body. The door will try to close twice, then it will just close through his body. If you see the trail of blood on the floor, which is really Lambert's when he was dragged in here, it will look as though Jamie was dragged in here, tortured, then had the door slammed through his body. When the JBA guards come over they will act strangely. Note: This may require a few attempts.

On the "JBA HQ Part 2" mission there are a certain number of optional objectives, one of which is to gather information from Emile's safe. If you do this successfully you must leave his office. The only ways out of his office are through the door (risky as you have a better chance of getting caught) or out into the courtyard. The issue with the courtyard is that there is only one way to get back into the headquarters, through Enrica's window. Before you enter the room, check the map. Notice that Enrica is in her lab working on the other end of the complex. However as soon as you choose to enter her room through the bathroom window, she will instantly appear in the doorway and attempt to scold Fisher. Fisher then proceeds to make a move on her and she lets him off with a warning "Next time, bring flowers", ending the mission.

At the end of the ninth mission, Kinshasa, when you have a sniper to shoot Hamza Hishima do not shoot him. If you do you will complete the mission. If you do not, the crane you are on will fall down. Then Emile will yell at Sam for missing Hishima. Sam angrily turns off his radio and the level in now extended for several minutes.

At the beginning of the mission you must go up a elevator. You will then get a checkpoint. When you enter this room, take out the guards. Make sure you are not wearing your sunglasses. When you walk in the next, big, room, the sun should be shining in your eyes. Flip your glasses down and you can see guards shooting out the windows you were looking at. Go to the right as soon as you walk in. Try not to draw too much attention. If you keep going to the right you will hit a window. An icon should appear at the bottom of the screen, indicating that you can use something. Press X PlayStation3 or A Xbox 360 and Sam will get out a small black tool, clip it on the window, whiz it around, then pull off a small circle that he has cut from the window. If you push forward on the window, Sam will put his legs through and squeeze through the hole so that he is now outside.

On the bonus mission, sneak up on Moss and press Stab. He will turn around and fight Sam. At the same time Moss will go through Sam.