Number Ninja
Four numbers follow a secret pattern — can you figure out what comes next? 10 sequences that get sneakier as you go. A hint costs 3 points, and the secret rule is revealed after every puzzle.
What comes next?
About Number Ninja — The Number Sequence Puzzle Game
2, 6, 12, 20 — what comes next? If you spotted the gaps growing by twos and answered 30, you'd make a fine Number Ninja. Each puzzle hides a rule inside four numbers, and your job is to crack it and predict the next one. Ten puzzles, getting trickier as they go, from steady steps to squares and double-step twists. It's a good fit for grade 6 and 7 kids building their algebra sense. The game's free, and the rule is revealed after each puzzle so you always see why.
How it works
Tap Start Cracking and four numbers appear. Work out the pattern, type the next number and press Check Answer. Nail it and you score; stuck, and you can spend three points on a hint or reveal the answer and move on. The rule is explained every time, so even a miss teaches you something. Ten puzzles wait, each sneakier than the last.
The skills behind it
Number Ninja trains the loop real mathematicians use: notice a pattern, test whether it holds, then predict what follows. That habit feeds straight into algebra and problem solving. Fancy more? Browse all our 19 free learning games, or race the clock in Math Sprint, our timed mental maths game.
Things people ask
Do hints cost anything in Number Ninja?
Each hint knocks three points off your score, so it's worth trying to solve a puzzle first and saving hints for the hard ones.
What sort of patterns show up?
Adding a fixed amount, square numbers, Fibonacci-style sums, and rules that change every other step. They get harder across the ten puzzles.
Is it too hard for a 12-year-old?
Not at all — the early puzzles are gentle, and each one's rule is revealed afterwards, so it teaches as it tests.