Story/ja

Portalシリーズでは、Aperture Science に囚われた若い女性Chell（チェル）を操作することになります. チェルはGLaDOS（グラドス）の設計したチェンバーの中で強制的に様々な難易度のテストを解かされます. Aperture Science が開発した機器の一部で、チェルが通るのに十分な大きさのポータルを生成することが出来る携帯ポータル装置(一般にポータルガンと呼ばれる)をゲーム序盤で彼女は使用することが出来るようになります. ポータルは相互間のゲートとして作用し、これによって素早く長距離を移動したり通常では到達できない場所に行けるようになります.

Portal
Portalにはパズルパートと脱出パートがあります.

Act 1: The Test Chambers（パズルパート）
ゲームはChellがリラックスルームから目覚め、GLaDOSから説明を受けるところから始まります. プレイヤーはテストに参加させられ、その後まもなく携帯ポータル装置を入手します. チェルがテストチェンバーを進むほどに、チェルにやる気を出してもらうためにGLaDOSはテスト終了後にケーキを与えると約束をし、テストは更に複雑になっていきます.

Portal: Still Alive
Portal: Still Alive は Portal の "XBOX Live Arcade" 版であり、"Portal: The Flash Version" に触発されて生まれたより難易度の高い新しいチェンバーが追加されています. ストーリーの追加はありません. このゲームは匿名のValve開発者によって確認されているため非公式のものとなります.

Portal 2: Lab Rat
公式コミック『Lab Rat』は Portal と Portal 2 の間の空白を埋めるストーリーです. このコミックによって Aperture Science 社の Doug Rattmann（ダグ・ラットマン）という研究員の存在が明らかになります.

Part 1
パート１では Enrichment Center にてダグ・ラットマンがチェルを追跡している様子が描かれています. ダグ・ラットマンは現実、そして心が現実をどう捉えるのかについて独白している人物です. また彼は統合失調症の為ジプラシドン薬を手放せません. 物語を通して彼は常にコンパニオンキューブを背負って運んでおり、コンパニオンキューブからの呼びかけやアドバイスが彼には聞こえるようです. メインストーリーはGLaDOSがまだ開発段階にある時期のフラッシュバックも交えて描かれており、ダグ・ラットマンがプロジェクトに関わっていたことが読み取れます.

チェルを発見して間もなく、薬をしばらく服用していなかったことに彼は気づき、コンパニオンキューブの助言に従わず最後の2錠を服用してしまいます. その際に最初のフラッシュバックが思い出されます. それは若いころのラットマンが、同僚2人が「身元不明の人間に怪しまれることの無いようカメラ内にカメラを仕掛けた」と話しているのを小耳に挟んだ時のものです. 彼が施設内を駆け回って新たな壁画を描いている間にチェルはテストチェンバー１９まで到達し、

そして次はGLaDOSの部屋でのフラッシュバックが思い出されます. それはラットマンと彼の同僚ヘンリーが仕事をしている光景でした. ヘンリーはGLaDOSの破壊方法をアインシュタインによる相対性理論の発見、またNASAによる月面着陸になぞらえて話をしています. ですがラットマンはGLaDOSの信頼性について疑問を述べました. なぜなら

現実に戻ったラットマンが

ここで入る3度目のフラッシュバックは、ヘンリーがラットマンに新発明の道徳心コアを見せている場面です. このコアは

再び現実に戻ったラットマンに、コンパニオンキューブが「今のうちに逃げろ」と言います. しかし彼は全ての責任は自分にあると思っており、逃走よりも

Part 2
パート２は施設の中を横切るラットマンの描写から始まります. コンパニオンキューブが「（パート１で服用した）薬が効いてきた」と彼に伝え、キューブの声はだんだん遠のいて行きます.

ここで再び入るフラッシュバックは. となってしまったラットマンがメインのテスト施設からの脱出を図る際、GLaDOSが彼の持つ統合失調症について愚弄してきます. GLaDOSがラットマンをなじり続け巧みに操ろうとしている最中、彼は

Back to reality, Rattmann is lying on the floor, wounded by the Turrets, reaches out to his Companion Cube but loses consciousness.

Another flashback begins, involving Henry having a conversation with GLaDOS. During the conversation, she tells him she would like to perform a recreation of the Schrödinger's cat experiment during "Bring Your Cat to Work Day". She says that added to the boxes and the cats, she needs a little neurotoxin. Henry, accepts, "as long as it's for science",

Doug regains consciousness, and his schizophrenia has returned. The Cube can talk again and asks about to which he admits it was just a hunch. The Cube then tells Doug to

Exhausted, Rattmann crawls into the bed of a Relaxation Vault and presumably falls asleep. It was later revealed by Valve that Rattmann

Map Names
It is recommended to look at the official maps to see exactly how this style is executed.

In alphabetical order, the maps in the single player campaign that use this style are:

The Courtesy Call (Act 1)

 * sp_a1_intro1.bsp
 * sp_a1_intro2.bsp
 * sp_a1_intro3.bsp
 * sp_a1_intro4.bsp
 * sp_a1_intro5.bsp
 * sp_a1_intro6.bsp
 * sp_a1_intro7.bsp
 * sp_a1_wakeup.bsp

The Cold Boot (Act 2)

 * sp_a2_catapult_intro.bsp
 * sp_a2_dual_lasers.bsp
 * sp_a2_fizzler_intro.bsp
 * sp_a2_intro.bsp
 * sp_a2_laser_intro.bsp
 * sp_a2_laser_over_goo.bsp
 * sp_a2_laser_stairs.bsp
 * sp_a2_pit_flings.bsp
 * sp_a2_trust_fling.bsp

The Return

 * sp_a2_bridge_intro.bsp
 * sp_a2_bridge_the_gap.bsp
 * sp_a2_laser_vs_turret.bsp
 * sp_a2_laser_relays.bsp
 * sp_a2_pull_the_rug.bsp
 * sp_a2_richocet.bsp
 * sp_a2_sphere_peek.bsp
 * sp_a2_turret_blocker.bsp
 * sp_a2_turret_intro.bsp

The Surprise

 * sp_a2_bts1.bsp
 * sp_a2_bts2.bsp
 * sp_a2_column_blocker.bsp
 * sp_a2_laser_chaining.bsp
 * sp_a2_triple_laser.bsp

The Escape

 * sp_a2_bts3.bsp
 * sp_a2_bts4.bsp
 * sp_a2_bts5.bsp
 * sp_a2_bts6.bsp
 * sp_a2_core.bsp

The Fall

 * sp_a3_00
 * sp_a3_01
 * sp_a3_03
 * sp_a3_bomb_flings.bsp
 * sp_a3_crazy_box.bsp
 * sp_a3_jump_intro.bsp
 * sp_a3_transition01.bsp

The Reunion

 * sp_a3_end.bsp
 * sp_a3_portal_intro.bsp
 * sp_a3_speed_flings.bsp
 * sp_a3_speed_ramp.bsp

The Itch

 * sp_a4_intro.bsp
 * sp_a4_jump_polarity.bsp
 * sp_a4_laser_catapult.bsp
 * sp_a4_laser_platform.bsp
 * sp_a4_stop_the_box.bsp
 * sp_a4_speed_tb_catch.bsp
 * sp_a4_tb_intro.bsp
 * sp_a4_tb_trust_drop.bsp
 * sp_a4_tb_wall_button.bsp
 * sp_a4_tb_polarity.bsp
 * sp_a4_tb_catch.bsp

The Part Where He Kills You

 * sp_a4_finale1.bsp
 * sp_a4_finale2.bsp
 * sp_a4_finale3.bsp
 * sp_a4_finale4.bsp

The Credits

 * sp_a5_credits.bsp

Co-op
The co-op campaign is set after the events of Portal 2's single-player campaign. In it, the two testing androids Atlas and P-Body of the Cooperative Testing Initiative carry out a series of tests in six different courses, each consisting of about eight or nine chambers. At the end of each course, GLaDOS sends the androids outside of the testing chambers and into the facility itself, claiming their help is needed to retrieve several Compact Discs "innocently" left lying around by the humans. In reality, she appears to be using the androids to help her gain control of the facility and gain information on "Area 219.32". After each out-of-chamber task, both androids are self-destructed and then reassembled in the Hub.

Calibration Chamber
The initial cooperative course whose main purpose is to 'calibrate' Atlas and P-body for each other, as well as their own controls. During this course, GLaDOS implies the idea that most of this course is a competition of who is faster, as well as initiating her general attitude of creating friction between the two.

Course 5: Mobility Gels
With the previous courses finished, GLaDOS can now access a vault in the lower levels which contains hundreds of human test subjects. She has determined that, given their inability to die, Atlas and P-body just aren't the same as human test subjects. They are sent to open the vault. These final chambers take elements from all the previous test courses while adding the Aperture Science Mobility Gels as an additional element. In particular, the creative use of Hard Light Bridges and Excursion Funnels in conjunction with the gels is a necessary aspect of completing the test. Upon reaching the vault, ATLAS and P-body open it by making similar gestures to the camera installed on the lock. GLaDOS claims to have more work for them as she destroys them. As the credits roll, GLaDOS scans the identities of the test subjects and makes remarks about them, both positive and negative, though in the end the comments are apparently all directed at one subject.

Course 6: Art Therapy
GLaDOS rebuilds Atlas and P-Body, claiming that 100,000 years have passed since the conclusion of the 'Mobility Gels' course. She also claims (unconvincingly) that all of the humans are still alive. She guides the two of them through a new set of courses (which are supposedly designed to be art exhibitions), though a number of mechanical failures occur, which GLaDOS attempts to cover up.

At the end of Chamber 4, the disassembly machinery fails, forcing ATLAS and P-body to make a detour through an incomplete test track. GLaDOS admits that she has been lying and reverses her original claim of the humans being fine, revealing that she has already killed them all during testing. She also comes clean that it has only been a week since the humans were "rescued," not 100,000 years.

GLaDOS believes that Chell has returned and has gained control of an old mainframe chassis, posing a threat to the facility. ATLAS and P-body spend the remaining chambers being "trained" as killing machines, though this merely involves solving further tests and being plied with generic insults. In the final chamber, GLaDOS informs the two that the reassembly machines have broken down and that if she doesn't regain control, their next deaths will be permanent.

The robots reach the chassis, but find that it is being controlled mindlessly by a crow nesting. Despite GLaDOS' calls for a retreat (due to her phobia of birds following her experiences as a potato), ATLAS gets the bird from the control panel and P-body manages to lock it out of the facility. GLaDOS then notices that the crow had been harboring three eggs, which she hatches in an "oviparous warming vault," planning to breed the chicks as "little killing machines". This reinforces speculation of using birds as test subjects as seen in Portal.

Trivia

 * In order to flesh out the story in Portal 2, Valve originally intended to include an exhibition within the Aperture Science facility, one composed of different dioramas showcasing various aspects of the company and its philosophy. The dioramas were ultimately cut before the final release due to pacing issues and the Cave Johnson voice lines have replaced that level so the player can solve Test Chambers while also getting to know more about the old Aperture Science chambers and trivia.