Goosebumps HorrorLand

This is the main section of the book, lasting approximately 100 pages. Since it reads identically to a classic Goosebumps book, readers will be most familiar with this section. It continues to incredibly more sections.

Technically a continuation of the first section (as well as a continuation of the previous books' "Enter HorrorLand" segments), this 30-40-page mini-story is a crossover which finds the book's characters invited to HorrorLand as Very Special Guests, meeting up with other books' protagonists and villains. Each HorrorLand segment ends with a "cliffhanger" ending, to be continued in the next book's HorrorLand segment. For example, in The Scream of the Haunted Mask, at the end, Carly Beth and Sabrina think that a werewolf is tackling them. In Dr. Maniac vs. Robby Schwartz, it is revealed that it was just Robby.

Only a few pages long and not included in the page count, each book's Fear File contains fictional maps, brochures, menus, etc. pertaining to the section of the theme park featured in that book, along with a hand-drawn map of the area. Each book also includes a fictional advertisement to its featured park area on the front page of each book. Most of the advertisements feature web addresses for EnterHorrorLand.com and EscapeHorrorLand.com. Each map can be connected to form the whole park map.

The order of the maps (from the top-left corner to the bottom-right corner): Top row: 6, 12, 4, 11. Middle row: 10, 8, 1, 9. Bottom row: 2, 3, 5, 7. The Fear File features which appear in the books are merely samples of the full chapters, which are published in full in Welcome to HorrorLand: A Survival Guide. The first ten chapters were originally located at escapehorrorland.com.

Some books feature single-chapter previews of the books on which they were based. For example, Creep from the Deep features a single-chapter preview of the original Deep Trouble. In addition, the back of each of book in the first arc shows half of a HorrorLand map token on either edge of the book. When two corresponding books, such as #1 and #2, are placed next to each other, the two halves match up and show a complete token; in this case, it features Slappy the Dummy. Following this pattern, the second book shows half of a coin that will only be complete when placed next to the third book, and so on. Each token has a unique message, written in mirror writing, around the edge. The tokens form different messages depending on whether they are placed against the following book in the series, or their corresponding companion reissue, which also bear half-tokens; for example, placing Revenge of the Living Dummy and Creep from the Deep together gives the message "Find This Token Online," but Revenge of the Living Dummy and the reissued Night of the Living Dummy spell "Find This Dummy Online." The twelfth, final token was never completed.

The books in the second arc, from #13 onwards, are also split into three parts - Part One is a mini-adventure in HorrorLand, Part Two tells the main story, and the Epilogue describes the hero's return to HorrorLand.

Online bookstores have posted a listing for more then-upcoming Goosebumps HorrorLand books, beginning with "When The Ghost Dog Howls", released on January 1, 2010. They have provided the following synopsis, implying that the series has been extended to include nineteen books with a new seven-book story arc:

Each eerie adventure of the next seven-book arc begins with a trip to the Chiller House, a gift shop only found in HorrorLand. Kids are invited to take a little horror home with them and given a souvenir and a miniature Horror. At home, the kids experience wild things with their "free" gift, while the glowing, menacing Horror keeps an eye on the fun. When it's time for their payment, the Horror takes them back to shopkeeper Jonathan Chiller.
Unlucky book #13 kicks off an entirely new type of terror that will keep you guessing and quaking until book #19.

Announced in May 2010, the third arc, known as "Hall of Horrors", contains six books. The arc's tagline is "The Hall of Horrors is open. Step into the nightmare!". According to the teaser at the end of book 19, the Hall of Horrors is "hidden in the darkest shadows of the park. It is the place for kids who have frightening stories to tell." Hall of Horrors is numbered as a separate series, beginning again at #1. The Hall of Horrors is run by a Horror called the Story-Keeper, who hears the stories of the protagonist when they visit the Hall of Horrors.

The website EnterHorrorLand.com is a "gameplay experience which immerses fans in HorrorLand itself".[18] It is based around twelve map sections corresponding to each HorrorLand book, each of which includes numerous mini-games. The premise of each map section is that the antagonist of the corresponding book is trying to take over that area of HorrorLand; the minigames tell the story of each antagonist's defeat by the player. Strangely, the player is frequently represented by Mr. Wood, the main antagonist from Night of the Living Dummy. Guidance and help are provided by the automated fortune teller named Madame Doom. The front page features two short animated movies, "What to Expect in HorrorLand" and "An Interview with Slappy", with a blank option suggesting a third to come. The site opened on February 20, 2008.[19] The site was redirected to Scholastic.com/Goosebumps/HorrorLand in November 2009.

The website EscapeHorrorLand.com was a "serialized, story-driven, fact-finding experience" hosted by the protagonists of One Day at HorrorLand.[18] It was ostensibly a blog that sought out, posted evidence and information about the HorrorLand theme park,[20] and was written by Luke Morris of One Day at HorrorLand.[20] His sister Lizzy also contributed to the site, largely in the form of extracts from a "Welcome to HorrorLand" guidebook[21] (ultimately printed separately as Welcome to HorrorLand: A Survival Guide). Luke's friend Clay was also mentioned.[22] Luke and Lizzy received HorrorLand correspondence from Madame Doom,[23] the mysterious "MONSTER-X",[24] who tells the Morrises that HorrorLand has changed,[25] and Slappy the Dummy.[26][27][28] Several of the correspondence props appear within the HorrorLand books themselves. The site opened on February 14, 2008, and ceased updating its blog on August 22, 2008; the HorrorLand survival guide had only ten of its twelve chapters posted. The site was closed and redirected to Scholastic.com/Goosebumps/HorrorLand in November 2009.