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Easter eggs

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This subject is related to a real world perspective.
This subject is related to the Black Mesa Incident era.
This subject is related to the Combine era.
This subject is related to the Portal era.
This subject is related to the Portal 2 era.

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This page contains a list of Easter eggs featured in the Half-Life and Portal series. Many are in-jokes, pop culture references, or simply hidden gags to reward curious players.

Half-Life and expansions[edit]


Half-Life: Opposing Force[edit]

Half-Life: Blue Shift[edit]

Half-Life: Decay[edit]

Half-Life 2 and Episodes[edit]

Half-Life 2[edit]

Half-Life 2 leak[edit]

  • There is a line[i] that was to be said by a security guard in a port of the Hazard Course from the original game. The line is: "Sorry, sir. You know I can't let you through here without your good friend Superfly Johnson. Wa hah. Just kidding, Gordon. You go on through. Hah haha!". Superfly Johnson is a character from the video game Daikatana, best known for his poor pathfinding skills. He is an ally, and has to follow the player through some levels. If the player reaches a loading point and the character is not with the player, the player character will say: "I can't leave without my buddy, Superfly!". It is also a reference to a line[i] said by the security guard when Gordon tries to go through a checkpoint without his suit on. The line is: "Sorry, Mr. Freeman, I got explicit orders not to let you through without your hazard suit on."

Half-Life 2: Episode One[edit]

Half-Life 2: Episode Two[edit]

Half-Life: Alyx[edit]

Portal series[edit]


Portal 2[edit]

Source SDK[edit]

  • The icon used for Hammer's obsolete entities consists of what presumably is the head of Jay Stelly pasted on the bust of Fonzie from the TV sitcom Happy Days, with his trademarks thumb up and leather jacket. It was created by Dhabih Eng early during the development of the Source engine.[16] The icon was updated for the Source 2 tools, using the same photo of Fonzie but a different one for Stelly.
  • Typing the example coordinates "200 -4096 1154" into the "Go To Coordinates" dialog in Hammer results in a dialog appearing, which reads "Seriously? (I mean, that was just an example, you were supposed to type in your own numbers)".
  • A line in the file sdk_weapon_parse.cpp from the 2013 edition of the Source SDK features a nod to Douglas Adams, author of the series The Hitchhiker's Guide to the Galaxy, and its number 42: m_iDamage = pKeyValuesData->GetInt("Damage", 42) // Douglas Adams 1952 - 2001.


  1. The girl in Gordon's locker turns 14 today on Reddit (January 3, 2012)
  2. YouTube favicon.png Half-Life (PS2) - Toilet Scientists Conversation Easter Egg on YouTube (June 8, 2011)
  3. Personal Touches in Borderlands: The Pre-Sequel on Gearbox Software's official website (December 11, 2014) (archived)
  4. .plan File for Randy Pitchford on Blue's News (May 9, 2000)
  5. John Faulkenbury's comment on The Easter Egg Archive
  6. YouTube favicon.png dsbossit.wav - Original and Reversed (OpFor Easter Egg) on YouTube (June 16, 2011)
  7. Twitter favicon.png Tweet: "It was me! That did the easter egg for HL Opposing Force, not that made that change to the wiki. That's actually my voice that I slowed down and reversed to match as closely as possible to the Romero one from Doom 2." @jfaulken (John Faulkenbury) on Twitter (January 10, 2022) (archived)
  8. YouTube favicon.png Half-Life: Decay - Pool Barney Easter Egg on YouTube (June 24, 2019)
  9. YouTube favicon.png Half-Life: Decay - Newly Discovered Secret Dialogue Easter Egg] on YouTube (September 14, 2016)
  10. YouTube favicon.png 20 Year Old Half-Life: Decay Easter Egg Found! on YouTube (July 11, 2021)
  11. Happy Easter! on Uncle Andrew dot Net (November 19, 2014) (archived)
  12. Twitter favicon.png ValveTime's tweet on Twitter (April 24, 2017)
  13. Post: "Saw this in Reddit. This graffiti art is in reference to my wife (girlfriend at the time). Her nickname is Ren and she was a vegetarian at the time. Hence, she hates fruits and veggies. 😂 Was just a little inside joke." Matt Wood on Mastodon (December 2, 2022)
  14. Half-Life 2: Episode Two commentary
  15. Twitter favicon.png ValveTime's tweet on Twitter (July 20, 2017)
  16. The mystery of the obsolete guy is solved! on (April 2, 2009)

See also[edit]