On a number line, adding means "jumping forward." The rocket parks on a number, the problem says how much to add, and your child counts that many steps ahead and taps the landing number — at 3, add 2, land on 5. Watching the rocket hop one step at a time helps kids feel that numbers are evenly spaced and that addition is moving forward along the line.
The rocket is on 3, add 2 more steps → it lands on 5
On 5, add 4 more → the rocket flies to 9
On 8, add 2 more → it reaches exactly 10. Boss!
💡 For parents
Pair it with finger-counting or counting steps at home. Have your child say the numbers out loud as the rocket flies — "four... five!" — so they feel that adding is counting onward. If counting on is still tricky, start with the short 0–10 line, then move up to longer lines and the levels with problems to solve (add and subtract). Short sessions of 5–10 minutes are plenty.
It teaches addition (with subtraction in later levels) within 0–26 using a number line, so kids see that the answer means jumping several steps forward. It ramps from easy plain numbers to problems they must solve, and suits kindergarten to Grade 1 children (ages 4–7) who can count and are starting to add and subtract.
A number line turns addition into movement kids can see: numbers are evenly spaced, and adding is hopping forward. It's an important foundation before pure-number addition and before subtraction (moving backward).
The game is gentle: a wrong tap only costs one heart and lets them try again, with no scolding or instant game-over. If hearts run out, they simply restart that level with full hearts. The goal is fun and brave tries, not fear of mistakes.
Completely free — no download, no sign-up. Open it in any browser on a phone, tablet, or computer and play together right away.