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Gravity Falls: Lost Legends is the first official Gravity Falls comic with new original content. It was announced at D23 on July 14, 2017, at Alex Hirsch and Daron Nefcy's panel promoting Gravity Falls: Journal 3 and Star and Marco's Guide to Mastering Every Dimension, respectively. It will be released on July 24, 2018.
- It was originally listed as XQWLWOHG PBVWHUB ERRN (which decodes to UNTITLED MYSTERY BOOK using the Caesar cipher) on Amazon Canada.
- The front cover was revealed via a jigsaw puzzle, made of Dipper Pine Trees, piece by piece on Twitter, Tumblr, and Facebook.
|Gravity Falls Merchandise|
|Books||Happy Summerween! / The Convenience Store...of Horrors! | Pining Away | Once Upon a Swine | Dipper's and Mabel's Guide to Mystery and Nonstop Fun! | Journal 3 | Dipper and Mabel and the Curse of the Time Pirate's Treasure! | Don't Color This Book! | Gravity Falls: Lost Legends|
|Cinestory Comic | Cinestory Comic Volume 2 | Cinestory Comic Volume 3 | Cinestory Comic Volume 4 | Shorts Cinestory #1 | Shorts Cinestory #2 | Shorts Cinestory #3 | Shorts Cinestory #4 | Shorts: Just West of Weird|
|DVD/Blu-ray||Six Strange Tales | Even Stranger | The Complete Series|
|Toys||Jazwares toys | Funko Pop! Vinyls | Vinylmation|
|Clothes||Gravity Falls apparel | Halloween costumes|
|Misc.||Subway Kids Bags|