HACKETTSTOWN, N.J. — Mars will be rolling out new Zombie Skittles for just in time for Halloween.

Each pack of Zombie Skittles features a mix of five fruity flavors: Petrifying Citrus Punch, Mummified Melon, Boogeyman Blackberry, Chilling Black Cherry, and Blood Red Berry. The ultimate twist? You don’t know which one may have the repulsive taste known as rotten zombie! Hidden beneath the candy shell of select pieces in the pack is a rotten zombie flavor that will reveal itself only once you’ve started to chew. It’s an utterly disgusting taste experience that will elicit strong reactions from anyone and everyone daring enough to try it.

“Our fans love Skittles not just for its delicious fruity flavors, but for the irreverence and sense of humor for which the brand is known,” said Rebecca Duke, Skittles senior brand manager, Mars Wrigley U.S. “This Halloween, we wanted to give our fans the ultimate rotten twist on the candy they know and love, challenging them to test their bravery over a bag of Zombie SKITTLES.”s

As part of the launch, Skittles Candy is daring its fans to take part in the #DareTheRainbow Challenge. It’s quite simple. Those brave enough to try Zombie Skittles are encouraged to gather a group of friends, record their experience as they try—and eventually taste—the hidden zombie flavor, and then share on Instagram using #DareTheRainbow and @skittles.

Zombie Skittles will be available in major retailers across the U.S. in Share Size (RRP $1.89), Lay Down Bag (RRP $2.49) and Fun Size Bag (RRP $2.99).