618 is the recurring arc number in Gravity Falls. The number is based on the date June 18, the birthday of series creator, Alex Hirsch, and his twin sister, Ariel.


The following are instances of 618 used in the show:

Multiple episodes

  • The show's main production code is G618.
    • E.g. Dipper and Mabel's rough model sheets are labeled "618G99.01."
    • E.g. An episode production code starts with 618, such as "618G-107" for "Tourist Trapped."
  • The Mystery Shack's address is 618 Gopher Road.[1]
  • The Mystery Shack's cash register is always seen displaying $6.18.[2][3][4] With the exception of the occurrence in "Dungeons, Dungeons, and More Dungeons."
  • In the attic of the Mystery Shack, an old game has the score 8190 which, when flipped, reads 0618.
  • In Tumbleweed Terror, the score on the barrel is 618.[5]
  • Gideon's school ID number is 618.[6]
  • The Whack a Customer[7] game in Dipper and Mabel's room has the number 819 on it, which, when turned upside down, is 618.
  • The introduction page of Journal 3 has the date June 18th, which would be 6-18.
  • The number 816, which is 618 backwards, appears multiple times on Bill Cipher's entry page in Journal 2.[8]
  • When Stan was in a Colombian prison, his prison ID number was S618.[8]
  • The number 618 appears on a post-it note with the reminder, "TK 618 Return 7/3 GF Library."[2][9]
  • Ford's quantum destabilizer is Experiment #618.

Season 1

  • One of the blocks the baby chews on Baby Fights, has the numbers 6, 1, and 8 on it.[10]
File:S1e19 Bill 618.gif
  • When Bill becomes angry, his eye flashes six symbols. The third, fourth, and fifth in the sequence are Thai numerals that spell out the numbers 6 1 8.[8]
  • A paper on the desk in the underground laboratory is seen with the Greek letter phi, a representation for the golden number: 1.618.[11]

Season 2


  • During "Old Man" McGucket's Conspiracy Corner Marathon, McGucket mentions the recurring number in the series, saying that it's been haunting his dreams, and even pointing out some of the times it was cited. He comes to the conclusion that, "it's a clue from a creature from another dimension that [they are] all just drawings on a page."


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