Welcome to the Sloomoo Underground, our private party room in our NYC space. Vivid color, a fuzzy lounge, and the ultimate throne can be all yours. Bring or cater food. Host classes. Drop all of your things off. And if you’re using it for a kid’s party, the adults can chill here while our slimetenders walk your guests through the space.


Please arrive 15 minutes prior to your designated time. A party concierge will meet your group at our front entrance - 475 Broadway between Broome and Grand. We will get you set up (adults can hang in the party room, drop off coats, gifts, etc.) and the guided tour will begin. *Parents may use the room and stay there for the duration of the party. Our “slimetenders” guide you through the experience, sharing insider stories, the best photo moments, and tips and tricks for slime playing. 

After Sloomoo Falls (the slime waterfall - we provide protective gear), your group will be escorted to The Sloomoo Underground for your food - or whatever you need.



10am - 1pm

2pm - 5pm 


10am - 1pm

2pm - 5pm

Pricing: $2,500 for 3 hours for up to 15 guests

$125 per additional guests
Max 30 guests 

We require a minimum of two weeks to plan all Sloomoo Celebrations.


The party does not need to stop once you leave the Sloomooverse! We have gift bag options to make everyone happy and feel special. Available upon request. 

1 Birthday Fun Goodie Bag - $35/bag

• Sheet Cake • Hope • Sticker Pack

2 Birthday Party Goodie Bag - $60/bag

• Birthday Cake Pop • Sprinkle Cake • Hope • Assorted Charm Pack

3 Birthday Extravaganza Goodie Bag - $110/bag

• Birthday Cake Pop • Sheet Cake • Sprinkle Cake • Red Velvet Cake • Hope • Strawberry Shortcake • Sticker pack • Playful Charm pack


Contact us about our catering options. We have a partnership with the most incredible bakery, BCakeNY, who created special Sloomoo cakes (you can choose from a ton of flavors, like vanilla buttercream, blue velvet and cream cheese buttercream, chocolate buttercream and more). We curated the best of for everything from pizza and bagels to the most decadent culinary indulgences.