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...in this way. In this way, the placement and location of portal-conductive surfaces is a fundamental design choice, and determines the way in which the puzzle( ...l 2]]'', the only way to overcome some puzzles that lack portal-conductive surfaces is through the use of [[Gels]].

...ted. It as the extra challenge such has a harder Infinite Jump, less white surfaces, a faster Suppressor Field and the removal of the supplementary ledge. * Place the portals on the only portalable surfaces on the floor.

...own what element it is yet, but I'll tell you this: It's a lively one, and it does NOT like the human skeleton.|sound=Cave_Johnson_fifties_second_test_co ...aces (such as glass), and will pass through grating (also without painting it). The only test elements that can be covered in gel are [[Cubes]] and [[Tur

...player is within a [[Test Chamber]] or area that features many metallic [[surfaces]] or is largely uniform. In order to overcome this, the player must use mor A third method can be used when the player only has access to horizontal surfaces of different heights, and/or needs to build height rather than travel dista

...izes the effects portals have when an object has both mass and velocity as it enters the portal, meaning the players must utilize both in order to pass t ==== Course Three: Hard-Light Surfaces ====

* Move your second portal across to ceiling portal surfaces to create a runway of [[Propulsion Gel]]. * Move your second portal to the end of the ceiling portal surfaces by the open side of the room.

* Take the cube and put it on one of the floor buttons. ...e. Go to the second room and place the second portal on some of portalable surfaces.

...me features a paint-gun which allows the player to alter the properties of surfaces around them, similar to how the [[Gels]] work in [[Portal 2]]. The project ...was removed because Valve found that it gave playtesters motion sickness. It was replaced with [[Conversion Gel]].

...own what element it is yet, but I'll tell you this: It's a lively one, and it does NOT like the human skeleton.|sound=Cave_Johnson_fifties_second_test_co ...esteitä, joilla on erilaisia vaikutuksia, kun niitä laitetaan erilaisten [[surfaces/fi|pintojen]] ja esineiden päälle.

...tra challenge such as two [[Turrets]] impossible to knock down, less white surfaces and a harder ending.

...enge such as [[Goo]] facing the [[High Energy Pellet]] catcher, less white surfaces and the catcher now timed.

This is the second co-op chamber in the game, and it introduces players to the use of the [[Edgeless Safety Cube]]. ...the other side. In the other room there are 4 switches and multiple portal surfaces.}}

...o portals will be linked. If a portal of the same color is already placed, it will be closed and the new one will be used instead, limiting the player to ...lso has the ability to pick up and manipulate objects directly in front of it in the same manner as the [[hl2:Gravity Gun|Gravity Gun]] from the ''Half-L

...o portals will be linked. If a portal of the same color is already placed, it will be closed and the new one will be used instead, limiting the player to ...lso has the ability to pick up and manipulate objects directly in front of it in the same manner as the [[hl2:Gravity Gun|Gravity Gun]] from the ''Half-L

...ngled, more [[Turrets]] including two impossible to knock down, less white surfaces and the [[Weighted Storage Cube]] replaced with a spherical replacement.

* Move your second portal around the various portal surfaces in the pit to spread [[Repulsion Gel]] over as much of the pit floor as pos * Pick up the [[Cube]] and jump with it into your first portal on the pit floor to fling yourself to the exit.

...e supervision areas, the motionless angled platform now moving, less white surfaces, the removal of the supplementary ledge, [[Goo]] almost everywhere at the l

...onto overhead areas. However, if Chell spams portals at the high platform, it will, as mentioned above, sit unaltered.}} Surfaces that are not flat or big enough to fit a portal will not be portal-conducti

...If one of the bots decides to perform the High Five, the other one will do it too. ...will take part in it too. Depending on the outcome, the bots will react to it by cheering or showing disappointment.

* Drop to the girder directly to the right and walk across it towards the [[Repulsion Gel]] pipe. * Walk forwards and enter the doorway after the fire in it goes out.