McDonald's new adult Happy Meal is taking customers back to McDonaldland, complete with a volcano-inspired shake that has a mystery flavor.

The fast food brand also launched an epic secret area in Fornite so you can visit the fantasy world.

The McDonaldland meal will be on menus nationwide for a limited time. The Mt. McDonaldland shake is colorful, based on a landmark on Grimace Island in the fictional, whimsical world. The vibrant drink represents blue "lava" and pink clouds. (The flavor is a surprise.)

The deals also feature a nostalgic souvenir with Ronald McDonald, Grimace, Birdie, Hamburglar, Mayor McCheese or the Fry Friends. The collectible tins include postcards, stickers and more.

Each combo has a new Mt. McDonaldland shake, a side of fries and the customer's choice of e

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