Design your own levels and challenge your friends to a battle for the gems. SEMBLY rewards players for creative strategies, speed, and level designs. As you climb the leader boards watch out for the special events that viewers can vote on! 

Do you live and breathe Fortnite? Then you’ll love playing our Black Rocket Battle Royale. You’ll need to think quick on your feet to out-build your opponents. Compete in weekly tournaments to win prizes!

Are you a Mario Kart Fanatic? Test your racing skills with our very own Rocket Kart Racers game, featuring maps created by other players and students! Tear up the track in weekly tournaments and become a track hero!


Black Rocket Summer Tournament


See where you stack up against your peers!

Youtube Livestream & Channel

Come join us on Fridays where we livestream tournaments.

We also share strategy videos, recordings, & more on our Youtube.

Follow all of the action on our Youtube Channel!

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We’d like to give a special thanks to all of those that support us!

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Join over 30,000 students worldwide in the first-ever eSports league for kids ages 8 to 14! Esports is one of the hottest growing careers in the world. Last year more people watched the eSports finals than the NBA finals!

Black Rocket’s motto is Safe – Fun – Learn. We designed our league, the eSports apps, and our unique online community, the Creator Corps, around those principles. Kids can choose to play either of our exciting games, Sembly® or Battle Royale®. Both empower kids to be creators and makers in a safe environment while learning about STEM careers and level design. Prizes and STEM scholarships are awarded throughout the year for our young designers.