Portal Part 1 - ( Chapter 1 to 5 )
2(Test Chamber 00) Chell wakes up in a so-called Relaxation Vault - with only a small table on which lays a mug, radio, and a clipboard listing test chamber hazards, as well as a toilet and a stasis bed of some kind - and is welcomed "again" by a Computerized Voice which states that "her specimen has been processed" and that "we are now ready to begin the test proper."
(Test Chamber 01) Here the player reviews how to use buttons, storage cubes, and portals.
(Test Chamber 02) As the tests progress she eventually acquires the first "portion" of the Aperture Science Handheld Portal Device, allowing her to place blue portals but not orange ones.
(Test Chamber 03) A simple puzzle using the newly acquired portal gun.
(Test Chamber 04) More buttons and boxes. At the end of the chamber, GLaDOS states that the next test chamber will not be monitored, as "part of a required test protocol."
(Test Chamber 05) This chamber contains two boxes and two buttons. GLaDOS reveals that "our previous statement suggesting that we would not monitor this chamber was an outright fabrication." This begins to hint at her malicious behavior. She then says that "We will stop enhancing the truth, in 3, 2 -" but is cut off before she can finish, effectively nullifying the statement.
(Test Chamber 06) In this chamber, the Aperture Science High Energy Pellet is introduced. Also introduced are brown walls that do not allow portals to be created on them. These are seen commonly throughout the rest of the game.
(Test Chamber 07) More energy pellets, also moving platforms known as "Unstationary Scaffolds" are introduced.
(Test Chamber 08) Acid pits are introduced in combination with Unstationary Scaffolds and energy pellets.
(Test Chamber 09) A so-called "impossible" test chamber utilizing buttons and cubes. The chamber does not mark the introduction of Emancipation Grills but rather the introduction of Emancipation Grills as a part of the puzzles themselves rather than simply being a part of the exit. This also teaches the player that going through an Emancipation Grill will close all existing portals if they did not realize previously.
(Test Chamber 10) A new concept is introduced known as flinging. As GLaDOS says: "Momentum, a function of mass and velocity, is conserved between portals. In layman's terms, speedy thing goes in, speedy thing comes out," This is said to both explain the concept and insult Chell.
(Test Chamber 11) Chell acquires the full Aperture Science Handheld Portal Device allowing her to place both blue and orange portals.
(Test Chamber 12) More catapulting, now with more freedom allowed through the use of the upgraded Portal Device.
(Test Chamber 13) The first "real" challenge. This chamber combines buttons, boxes, energy pellets and Unstationary Scaffolds.