▲
1
▼

▲
1
▼

▲
1
▼
There are a couple of areas in the game where you can trap yourself in a test chamber with no way to get out. Once the developer figured out that the player could do this, they programed GLaDOS to open an escape route which earned an achievement called "Like A Rat."
▲
1
▼

▲
1
▼
Throughout the game, a heavily corrupted cake recipe will scroll across various computer monitors. On the second to last level of the game, a GLaDOS memory core will also recite the recipe. Many of the ingredients on the list are real Black Forest Cake ingredients, however there are oddball ingredients including rhubarb, polyester resins and many miscellaneous fish-shaped objects.
▲
1
▼
In the observation rooms, the keyboards have the letters A, S, D, E, R, H, N, I, and P highlighted in yellow. Unscrambling the letters spells "Adrian Shephard" who is the protagonist of Half-Life: Opposing Force.
▲
1
▼
A presentation about financial competition between Aperture Science and Black Mesa can be seen in-game Spoiler:while exploring the Aperture offices just before the boss room with GlaDOS, setting the game within the Half-Life universe.
Related Games
Portal 2
Poker Night 2
LEGO Dimensions
F1 2002
BrĂ¼tal Legend
Black & White
Half-Life: Opposing Force
SimCity 4
Command & Conquer: Generals
Oddworld: Stranger's Wrath
Diablo
SimCity 2000
Battlefield 3
Half-Life: Blue Shift
Crusader: No Regret
Mirror's Edge
The Simpsons Skateboarding
Cel Damage
Shaq-Fu
FIFA Soccer 2005
FIFA Soccer 13
Galidor: Defenders of the Outer Dimension
The Simpsons Game
Half-Life 2: Episode One
Dead Space
Zubo
Harry Potter and the Sorcerer's Stone
Mass Effect 3
MySims Racing
Tales of the Unknown: Volume I - The Bard's Tale
Harry Potter and the Chamber of Secrets
Vampire: The Masquerade - Bloodlines
Sword of Sodan
Mass Effect
Twinsen's Little Big Adventure Classic
Battletoads
Star Wars Battlefront
Crysis 2
Populous
Pandemonium!
Dead Space 3
Half-Life: Decay
FIFA 2001: Major League Soccer
James Pond 2: Codename - RoboCod
Need for Speed Most Wanted U
Dragon Age: Origins
Black & White 2
Battlefield Hardline
Spore Creature Keeper
Need for Speed: Hot Pursuit 2