MINNEAPOLIS, Minn. — A box of Marshmallow Only Lucky Charms has always been the unicorn of the cereal world — fantasized about, but never seen.

The Lucky Charms team receives countless calls, emails, tweets and Facebook posts from marshmallow-obsessed fans longing for a box filled with only the magically-delicious marshmallows.

Yes, you read that correctly.

But there is a catch. There are only 10 boxes available.

So, how can you become one of the Lucky 10?

It’s simple! Just share a photo of yourself holding an imaginary box of Lucky Charms on Facebook, Twitter or Instagram between now and Oct. 18 using #Lucky10Sweepstakes.

The sweepstakes will live exclusively in social media because that’s where Lucky Charms fans continuously express their love for the brand, especially the marshmallows.

“We wanted to tap into where that love is and it’s across Facebook, Twitter and Instagram. Lucky Charms is one of the most Instagrammed cereals and these platforms are the right place to ignite and connect to the passion we hear about,” says Amanda Hill, associate marketing manager, Lucky Charms.

The Marshmallow Only sweepstakes is a way for the brand to show fans some love in return.

“We wanted to have a little fun and connect with our fans. It needed to be easy and accessible for everyone to have a chance to win and celebrate what makes us, us – the marshmallows,” Amanda says.

Let the marshmallow mania commence!

*The sweepstakes ends October 18. You must be 18 to enter and a legal resident of the United States or District of Columbia. There are three ways to enter- via Facebook, Twitter or Instagram. Limit of three entries per person, one per entry method. Potential winners will be notified on or around Oct. 20, 2015.

For full rules and regulations, visit the Lucky Charms Facebook page.