After surviving the scavenger hunt, campers may also participate in blood tag match and camp talent show. (Great Horror Campout/Facebook)

When summer arrives, so does the sunshine and trips to the great outdoors. But while most campers will enjoy making s'mores and hiking this season, many on the West Coast have signed on for a much creepier experience — camping in a horror movie.

The Great Horror Campout is an all-night, interactive scavenger hunt and sleepover that has toured up and down the West Coast in recent months. The latest stop was in Seattle, from June 25-26.

From 8 p.m. to 8 a.m., people spend the night being chased down by a mishmash of scary movie tropes, including zombies and ax-wielding maniacs. Campers can choose their level of engagement, from the "Chicken Zone," where you roast marshmallows and watch horror movies, to the extreme horror experience where you are "fair game" all night long.

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The higher octane experience includes up-close encounters with your worst nightmares, and challenges that may lead to patrons being kidnapped, caged or chained up. Fortunately, there's a safe phrase. Shout "I want my mommy" at any time, and the monsters will leave you alone. Seriously.

According to Thrillist, the only way to win is to survive the night. Following the scavenger hunt, participants have to make it through a tournament-style Blood Tag Match, or possibly a Camp Talent Show, and constantly listen for important rule changes that could disqualify hundreds at one time. The winners are crowned "Hellmasters" of the night.

The campout has attracted a range of people, including outdoor adventure addicts and fright fans. Ten Thirty One Productions developed the concept and recently scored a $2 million investment in the project on ABC's "Shark Tank."

"Horror as a genre is the number-one movie genre in the world," Melissa Carbone, president and CEO of Ten Thirty One Productions, told Mercury News. "People love to be scared in a safe environment; there's an adrenaline rush similar to going down a massive roller coaster. There's a rush, an adrenaline to surviving that, and with horror it's the same thing… You can't bottle it; the only way is to seek out something that terrifies you."

To decide if you have what it takes to live out this nightmare campout, check out the gallery above. The next cities on the tour will include Portland, San Diego and San Bernardino.

(FORECAST: San Diego | San Bernardino | Portland)

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