In an irresistible union of two of the world’s most beloved brands, Airbnb is offering a night at the new Lego House in Billund, Denmark. But only if you put your imagination to work.

A new Airbnb listing explains the contest. To enter, you have answer a single question in less than 500 words: If you and your family had an infinite supply of Lego bricks, what would you build?

You have until Nov. 16 to submit. The winner, and up to three friends or family members, will get to spend the night at the Lego House on Nov. 24 “among an infinite supply of Lego bricks—and create a version of your entry with a Lego Master Builder.”

This video explains more:

The newly opened Lego House in Billund, Denmark has already drawn builders of all ages from all over the world. Now Airbnb and Lego House are giving your family the chance to have the place to yourselves for the night—and to make your wildest Lego vision a reality. Your journey will start when Jamie, one of the finest master builders in the world, welcomes you into the Lego House and sparks your imagination with top-secret Lego tips and tricks. Then he’ll join you for lunch served by two friendly robot waiters—but first you’ll have to build your meal order out of bricks. Next, the doors will close to the public and Jamie will lead you on a private expedition. You’ll stand at the foot of the Tree of Creativity, built by hand from over 6 million bricks, and then explore the Masterpiece Gallery, showcasing Lego creations from fans all over the world. From there, you’ll head to the Experience Zones, where you can direct your own Lego movie, engineer robotic cars and send them flying over jumps, design cities, and much more. Since all this creativity will no doubt bring up memories of your favorite childhood Lego creations, the next stop is the basement, where you can trace the timeline of Lego history and rediscover the most iconic sets ever produced. Finally, you’ll reach your destination: a bedroom floating in a pool of bricks underneath a 6-meter-tall Lego waterfall. Everything around you is made out of Lego bricks: armchairs, lamps, the alarm clock, the TV, your favorite story book, and even the cat. But before you drift off into your most colorful dreams ever, there’s building to do. After all, it was your winning idea that brought you here. Drawing on Jamie’s expertise, you’ll use the endless supply of bricks to make your vision a reality. The next morning, after breakfast and before the doors reopen to the public, there’s one final surprise. We won’t reveal it here, but let’s just say that in some small way, your family will leave your footprint in Lego House long after you leave, just like the memories of your time here.

Here’s the Airbnb description, which is worth a read:

• Play is mandatory!

• Parents are advised to wear Lego-proof slippers at all times.

• If there’s anything you miss in your bedroom, feel free to build it yourself.

• The bed is so comfy, you might need a brick separator in the morning.

• If 25 million bricks aren’t enough, a real Lego moulding machine is installed in the lobby.

• We know you’re looking for that one rare brick, but please refrain from diving into the Lego pool.

• No night at the Lego House would be complete without BRICKfast in bed.

• State of the art home security: Just throw some bricks on the floor before leaving!

And here are the “house rules” you’ll need to follow:

Read more about the contest at the listing.