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- ...that GLaDOS', Turrets' and Caroline's voice actor, Ellen McLain, also voices the Administrator in Team Fortress 2 and the Overwatch in the Half-Life 2 series?
- ...that GLaDOS stands for Genetic Lifeform and Disk Operating System?
- ...that Ellen McLain is also an opera singer and sang the Turret Opera?
- ...that Valve employee Richard Lord was the original, placeholder voice for Wheatley?
- ...that Portal 2 originally wasn't going to have portals?
- ...that there were plans for "sticky gel" in Portal 2?
- ...that both Portal and Portal 2 derived many of their ideas from prototypes made by Digipen students?
- ...that the cake in Portal is a Black Forest cake that project lead Kim Swift chose at a nearby bakery?
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- ...that the cake is a lie?
- ...that the cake is a Black Forest cake, a culinary specialty from south Germany?
- ...that Valve's webcomic Lab Rat explains Chell's survival?
- ...that Portal's main character was originally going to be male?
- ...that Portal 2's co-op mode was once planned to feature Chell and a second human character named Mel?
- ...that Rattman can seemingly be heard rambling in Pull the Rug in Portal 2?
- ...that defective turrets may still be dangerous?[1]
- ...that there's a third unidentified person in the background of the Caroline portrait?
- ...that the Portal 2 preview at E3 2010 showed a testing element called the Pneumatic Diversity Vent that didn't end up being used in test chambers?
- ...that there is an interactive trailer for the movie Super 8 in the PC version of Portal 2?
- ...that pre-recorded messages of GLaDOS originally took the place of the Announcer's voice lines in the first chapter of Portal 2?
- ...that Ellen McLain favors GLaDOS over all other characters she has portrayed in Valve games?
- ...that there is a cut type of turret called the Hover Turret which looked like a personality core?
- ...that Portal 2 was originally going to be a Prequel, with no Chell, GLaDOS, or portals?
- ...that the Animal King Turret was planned to marry off one of its Turret's to Chell? [2]
- ...that there were plans for a "Reflection Gel" in Peer Review?
- ...that Chell was once planned to speak in Portal 2's ending sequence?
- ...that all Test Chambers of the Portal 2 Sixense MotionPack DLC were created by only two people, Danny Woodall and Chip Sbrogna? [3]
- ...that Ellen McLain wrote a song to be used as an easter egg in Portal 2, known simply as "GLaDOS' Song"? [4]
- ...that High Energy Pellets are reused almost directly from Half-Life 2 (still called "Combine Balls" in the game files), and were also once planned to be in Portal 2?
- ...that Portal 2 internally has four "acts", separate from chapters, shown by map names and referenced in Developer Commentary (Chapter 6 was referred to as "Chapter 3")?
- ...that the number of soundtracks in Portal 2: Songs to Test By (Collectors Edition) is exactly 77 tracks? [5]
- ...that in Portal Test Chamber 16 you can move the wall blocks from Rattmann's den through portals and kill turrets with them?
- ...that in the video showing Portal 2's level editor, in the scene where everyone is working on a test chamber, one of them is watching Meet the Pyro rather than making a test chamber?
- ...that in a 2006 build of Portal, GLaDOS was a floating cube of HL2 rollermines?
- ...that when screws are visible on GLaDOS's monitor in the Portal bossfight, if you have only played that map, you will see one screw, but if you have played more than one, you will see multiple?