Genius Gems: STEM Play Space in Millburn, NJ & Chelsea, NYC
Build big. Then build bigger.
Genius Gems is a hands-on STEM play space with the world's largest collection of magnetic tiles, in Millburn, NJ and Chelsea, NYC. Open play for ages 4 and up, after-school classes and camps for grades K–6, and birthday parties families still talk about.
- The world's largest magnetic tile collection — 100,000+ tiles in NYC and 30,000+ in Millburn.
- Two locations — Millburn, NJ and Chelsea, NYC.
- Ages 4 and up — Open play with a grown-up; programs for grades K–6.
- Made by hand — Real building, not screens.
Play, learn, celebrate.
Everything we do starts with building something. Pick the way in that fits your family.
- General Admission (Ages 4+) — Open play with the world's largest collection of magnetic tiles, the Design Bar, robot stations and challenges with prizes.
- Memberships (Families) — Unlimited visits plus member pricing on programs.
- After-school classes (Grades K–6) — Weekly coding, robotics, engineering and design classes, with school pickup where offered.
- Mini camps (Grades K–6) — Full-day STEM camp on the days school is closed. Book one day or several.
- Summer camp (Grades K–6) — Weekly themed camp all summer long: a new project every day, builds that fill the room.
- Birthday parties (Ages 4–12) — A private room, a host, and the whole play space. We set up, we clean up.
- Date Night (Grades K–6) — Drop the kids off for an evening of building, pizza and a movie while you go out.
- Field trips (Schools & groups) — Hands-on STEM visits for schools, camps and groups, planned with your teachers.
- Scouts (Troops) — Badge-earning coding and engineering events for troops.
- After Dark (Adults) — Team-building, private events and the AI Flavor Lab, for adults.
Hands-on making, not screens.
Genius Gems started with one idea: kids learn best when they can hold what they are learning. Our rooms are full of magnetic tiles, robots, circuits and the Design Bar, and our team is there to build alongside them. Nothing here happens on a tablet.
Two locations, one idea.
Each location has its own hours and its own tickets. Pick the one closest to you.
Genius Gems Millburn, NJ
Our first home, on Millburn Avenue: a bright, open floor of magnetic tiles, a climbing wall, the Design Bar and classrooms for after-school programs.
215 Millburn Avenue, Millburn, NJ 07041
Today: 10:30 AM – 5:30 PM
Hours
- Mon–Fri: 1:00 PM – 5:30 PM
- Sat–Sun: 10:30 AM – 5:30 PM
Get tickets (from $15.99) · Directions · More about Millburn, NJ
Genius Gems Chelsea, NYC
On 6th Avenue in Chelsea: two floors of building, a glow-in-the-dark room, the Design Bar, a café, and classrooms for after-school programs.
555 6th Avenue, New York, NY 10011
Today: 10:30 AM – 5:30 PM
Hours
- Mon–Fri: 1:00 PM – 5:30 PM
- Sat–Sun: 10:30 AM – 5:30 PM
Get tickets (from $29.99) · Directions · More about Chelsea, NYC
Adults build here too.
After Dark is Genius Gems for grown-ups: team-building, private events and the AI Flavor Lab, in a room unlike any conference center. Explore After Dark
Inside Genius Gems
Questions families ask
What ages is Genius Gems for?
Open play is for ages 4 and up with a grown-up. Classes, camps and Date Night are for grades K–6. Birthday parties suit ages 4 to 12.
Do we need to book before we come?
Yes. Every visitor needs a ticket, including adults, and there are no door sales. Reserve a session online and walk in ready to build.
Is it the same at both locations?
Same idea, two rooms. Each location has its own hours, tickets, classes and camps, so pick your location first.
Do you host birthday parties?
We do, at both locations: a private room, a host and the whole play space. See the parties page for packages and dates.
Can adults come without kids?
Yes: After Dark is our adults-only side, for team-building and private events.
Come build with us.
Choose your location to see today's hours and get tickets.
Visit Millburn, NJ · Visit Chelsea, NYC
Questions? Email information@geniusgems.com