Narrative Structure

There are three main types of narrative structures and they are simply beginning, middle and end.

Act one

Act one is the set up of the story and is always at the beginning. There are any many ways of starting a story for example some story's, for example splinter cell, start the story at the climax in act 3, and just before the main plot of the story unfolds, you are sent back to the actual beginning. This is a good technique because it can keep you guessing throughout the story. Act one usually sets up the scene for the whole story and sets up a series of events that the player will have to go through.

Act two

As mentioned before, act two is the main bulk of the story and is generally the events in which act one set up. this is where the player will have to carry out those events or actions to progress through the story and get to the finish. typically, act two is the largest and longest part of the story, mainly because this is where all of the conflict happens and all the events happen. Act two can also be very informative to the story, as secret hidden gems will be able to be accessed in this part of the story.

Act Three

Act three is always considered yo be at the end of the story. This is where the climax of the story comes to a close and all loose ends are tied off leaving no cliff hangers. Unless the writers want to make another book, movie or game. This section is usually where the meaning of the story is revealed and the character may have learnt something new about him/her, life, love ect. This is usually shorter than the others by a lot because the ending must not have any roller-coaster emotional ups and downs, because the story must come to a close. This si also where lessons are learnt and the moral of the story is revealed. The main character may turn to normal again, or because of the changes that have happened throughout the story, changed them for the better. At the end of the story this is also where a twist can suggest a squeal.

Game Story lines

The Halo Series
Act One
The story line of Halo is very complex and last for over 5 games with a sixth "Halo 4" coming out soon. The story line consist of a main character "Spartan 117" who is part of a government project to create a super soldier and defend the galaxy. Conflict begins when the "Covenant" begin to assault one of humanities strongholds called "Planet Reach". The Covenant believe that the humans are a disgrace to their god the "Forerunners", and move to exterminate the human race.
Act Two
In the main bulk of the story you play as Master Chief/Spartan 117 as the last remaining super soldier sent to defend humanity against the constant Covenant attacks. The Covenant believe that the Forerunners created these ringed worlds called "Halo's" as a beacon that would transfer them to another dimension of peace and glory. But in actual fact the Halo's where designed to combat the biggest threat known in the galaxy. "The Flood". The Flood are a lifeforms which attach themselves to a host and mutates it. The flood are unlimited in number and have the capability to destroy a race of life in less than a week. Not knowing this the leaders of the Covenant intend to "light" the Halo rings and send themselves into heaven. Not knowing that they were built to up the entire galaxy to destroy the flood. Therefore you, as 117, have to go on a variety of adventures and missions with the marines to find out what is really going on.
Act Three
The Halo series has had a total of five games with another on the way. Therefore it is difficult to say  how and when the story will end. However the trilogy (Halo 1, 2 and 3) tells a story of master chief fighting the covenant and the flood. In the last of the trilogy you find "The Ark" which is a device that activates all of the Halo rings. 117 sets out to destroy it along with the hive mind of the flood "The Gravemind" which controls all of the flood. At the climax of the story 117 decides to activate the ark and one of the last remaining rings because it is outside the blast radius of the galaxy. Whilst being chased by the flood and the Covenant, Master chief must get off the planet and through the portal to safety to avoid the explosion. His ally "The Arbiter" makes it through okay, and the master chief is cut off and left drifting through space, cryogenic-ally frozen to await rescue. After the credits however, you see the ship 117 is on floating towards an unknown planet.

Portal 2
Act 1
You play as main character Chell. Chell wakes to find herself in what seems to be some kind of hotel room. Shortly after there is an announcer puts her through some tests and then she is put back to sleep again. She awakes several years later and the science facility that she was in has become overgrown with vegetation. Whealtley appears and moves the room/container she is in to reveal a giant warehouse of I dentical boxes and chambers. The pair of them begin to plan their escape.
Act 2
As they are escaping they accidently reactivate GLaDOS, which has been the AI of the entire facility. In the previous game you manage to kill her and she hasn't forgiven you. She separates you and Wheatley and starts to rebuild the facility. GLaDOS starts to put you through a series of puzzles and tests before you meet up with Wheatley and try and escape again. You eventually both disable the Nuro toxin which is deadly to humans and the turret facility before confronting GLaDOS for the second time. You fight GLaDOS and perform a core transfer separating her from the system. Wheatley becomes the new AI and becomes intoxicated with power and places GLaDOS into a battery potato. He betrays you and puts you and GLaDOS into an abandoned area of the facility. You then need to find your way back and confront Wheatley.
Act 3
After finding your way back into the main facility you manage to hatch a plan to kill Wheatley. He then tries to trick you into a bunch of death traps ad fails. While fighting Wheatley the facility goes into nuclear meltdown and he loses control of the facility and begins to go insane whilst you try and initiate a new core transfer. Just as you are about to push the button to initiate the transfer Wheatley activates a boobie trap leaving a small hole in the ceiling allowing you to see the moon. You then portal the moon and Wheatley becomes stranded in space with the corrupted core. GLaDOS becomes the AI again and forgives you and tells you to leave. You then get into the elevator and get back to the surface.

Splinter Cell:Conviction
Act 1
Act 1 begins with a man being interviewed about the where abouts of main character Sam Fisher.  After having disappeared, Sam Fisher is remotely located and contacted by former Third Echelon colleague Anna in a marketplace situated in Valletta, Malta where he is investigating rumours that the hit-and-run death of his daughter Sarah might not have been accidental.

Act 2
The main bulk of the story follows Sam Fisher and his search for the truth. He encounters many different challaenges like interrogating enimies for answers. Also fighting in hand to hand as well as gun combat. Stealth is his ally as the game play is fast paced but has a sense of finesse as you picking off enemies one by one. Following the trail of his daughter he finds himself being roped into a situation that even he cant explain. With his own company that he used to work for gunning for him he cant trust anyone. After the revelation of finding out that his daughter may still be alive he quickly gets back in the game to find out as much as he can. As you play through the game with him you feel as though you are right there next to him and understand how he feels. It becomes more apparent that Sam will finish anyone who gets in his way and prays that one day he will see his daughter again. As he looms closer and closer to an answer, the plot thickens and it becomes apparent that Sam will not only have to save his daughter, but also America itself.
Act 3
The climax of the story ends up with Sam's old boss trying to take over presidency, by force. He has an army at his disposal and uses it at his own will. Sam now has to prevent this form happening to save his daughter. After fighting his way through the White House he comes face to face with the maniac himself and there is a stand-off  "Reed" who is the man who is doing all this has a gun to the president and his friend "Grim". After Reed is done talking you manage to break free of being restrained and kill Rees's guards. You interrogate Reed and get given the choice to kill him or let him live. Either way he dies because Grim executes him there and then.  The story then returns to present day and back to the interview. "Vic" who is being held against his will says "Sam always come back for family...like a brother...that's family right?" Gun shots and explosions are then heard implying that Sam has come to save his friend. This is where the screen fades into black and the game ends.