Number Ninja

A grid of numbers and one instruction — the smallest even number, the largest prime, the number closest to 50, the one that breaks the sequence, 7 × 6 − 5. Every puzzle has exactly one answer, and the kinds you get wrong come round more often.

Number Ninja is mental arithmetic and number sense in short bursts: a grid of numbers and one instruction, with exactly one right answer every time. The kinds of question you get wrong come round more often, so the game drills what you find hardest.

How to play Number Ninja

Read the instruction — the smallest even number, the largest prime, the number closest to 50, the one that breaks the sequence, or a sum such as 7 × 6 − 5.
Tap the number in the grid that answers it.
Every puzzle is checked before it is shown, so there is always exactly one right answer.
Play against the clock, or in Practice, where the working is shown after every answer.

Scoring

A right answer is 10 points, and up to 5 more for a quick one.
Five good decisions in a row start multiplying your points, up to three times.
A wrong answer, or running out of time, costs 5.

No clock

Choose No clock to play twenty rounds at your own pace: each round waits twice as long, there is no bonus for speed, and a wrong answer or a miss costs nothing — it only breaks your combo. A no-clock game keeps its own best, apart from the timed one’s.

Tips

For primes, rule out the even numbers and multiples of 3 and 5 first — what is left is quick to check.
For “closest to”, compare distances, not the numbers themselves.

Play it with friends

On your own, against the characters — each plays the game by its own rules the moment it starts, so there is always somebody to beat.
With friends, each on their own phone or laptop: one of you shows a code, the others type it in, and everybody gets exactly the same game on the same Go.
Taking turns on one device — pass it round, and each turn is scored against the turns before.

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