FreeNo adsNo sign-upsNothing collectedMade in the Blue Mountains

Number Ninja

Adding and taking away, by finding the pair that works

Ages 6-8 Numbers and counting Free, no sign-up

Play Number Ninja More in The Bobbing Billabong

How it plays

A target appears — make seven, say. Your child taps one number, then hunts for its partner. Get the pair right and both clear away. Get it wrong and nothing happens except a friendly nudge; no points are ever taken away.

What it's for

Adding and taking away, by finding the pair that works. Your child sets the difficulty on the first screen — how fast things move, how many there are — so the game meets them where they are rather than deciding they aren't good enough.

There is no score to lose, no timer running out on them, and no way to fail. A level ends when it's won. That's the only way it ends.

What it costs, and what we collect

Nothing, and nothing. There is no account, no advertising and no tracking of any kind. Which games have been played is remembered on your own device and is never sent anywhere. The full version is here, and it's short.

Two numbers went sneaking about in the night, One looking left and one looking right, They found one another and clung on tight — And that's how you train as a Number Ninja.

Where it lives

Number Ninja lives in The Bobbing Billabong — numbers and counting. It works on a phone, a tablet or a classroom screen, and once it's been opened it keeps working with no signal at all.