Math facts at lightning speed.
Numberbolt is a competitive math game that makes addition, subtraction, multiplication and division practice feel like a race, not a worksheet. Beat your best time, climb the leaderboard and watch your skills grow.
Trailer coming soon
Get a first look at Numberbolt in action.
Everything you need to master math facts
Fast, focused drills with real competition and progress you can actually see.
All four operations
Addition, subtraction, multiplication and division drills with 0–12 and 0–20 fact ranges.
Timed, Survival & Custom
Race the clock, see how long you can last, or build a practice session that fits exactly what you need.
Progress you can see
Separate player profiles with saved history, progress trends and practice suggestions for every player.
Online leaderboards
A leaderboard for every game mode, so there's always a new record to chase.
Not just another math app
Most math games hide a few problems inside a lot of distractions. Numberbolt puts the math front and center and makes getting faster the fun part.
Speed, streaks and leaderboards give kids a reason to come back and beat yesterday's score.
Every second of play is math-fact practice, with suggestions that point players to what to work on next.
Numberbolt is designed and programmed by our family at Sleeperverse Studio.
We build games we'd want our own kids to play, and we listen to our players.
Become a Numberbolt Founding Member
Be one of the first 100 players and lock in the lowest price we'll ever offer, for as long as you're a member.
- $5/year in perpetuity instead of the regular $7/year
- The Founding Member title, forever
- Direct access to our dev team for feedback, issues and requests in our private Facebook group
- First access and test invitations for future Sleeperverse educational games and apps
- Founding Member status on the other games we develop
Help us shape Numberbolt
Numberbolt is in its final touches and about to enter Beta. Beta testers play for free in exchange for feedback, and join our private Facebook group where we share updates, run polls, and hear your ideas, questions and glitch reports.
Where Numberbolt is headed
Here's what we're building toward for the full release. Founding Members help us decide what comes first.
Family and group accounts with individual player identities and public leaderboard aliases.
More focus on the facts a player struggles with, while still reinforcing the ones they've mastered.
See exactly which facts you know well and which still need work.
New levels for learners ready to move beyond the basic facts.
Milestones for streaks, accuracy, speed, survival records and long-term improvement.
Practice suggestions based on accuracy, response time, missed facts and recent play.
Accuracy, speed, improvement and fact-family performance in one place.
Keeping competitive leaderboards fair for everyone.
Choose drill length, operators, fact ranges, difficulty and practice goals.
An easy start for new players and parents.
More ways to make Numberbolt comfortable for every player.
Progress that follows each player across supported devices.
Including iOS, Android and Steam.
Gameplay, interface, animation, sound and performance improvements leading into launch.
Help us keep making honest, kid-safe games
Sleeperverse Studio is a family working together to build educational games we're proud to put in kids' hands. Every donation, big or small, goes straight into building Numberbolt and the games that come after it.
You choose the amount at checkout.
💛 Donate any amountMeet the family behind the bolt
We're a homeschooling family from Texas who decided to build the math game we wished existed. Numberbolt is our first game, designed and programmed together, one lightning-fast fact at a time.
When can I play?
Numberbolt is about to enter Beta. Founding Members and beta testers will be the first to play. Sign up above and we'll let you know the moment it's ready.
What does the Founding Membership include?
Access to Numberbolt for $5/year for as long as you remain a member (instead of $7/year), the Founding Member title, direct access to our team in our private Facebook group, and early access and test invitations for our future games and apps.
What happens when the 100 spots are gone?
Once all 100 Founding Member spots are claimed, you can join the waitlist for the official launch.
Which devices will it run on?
Numberbolt is being built for iOS, Android, Windows, macOS and Linux, with a Steam release planned.
Who is Numberbolt for?
Anyone who wants faster, more confident math facts: public, private and homeschool students, parents, teachers and math enthusiasts of any age.