Ninth Cell
How sharp is your reasoning?
A free 20-minute IQ-style test built from logic puzzles, with an honest score and range — never hidden behind a paywall. 24 questions that adapt to you, 16 kinds of puzzle, a puzzle a day and practice with every rule explained.
Screenshots
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What's in the game
An honest score
Your score on the familiar IQ-style scale and the range it most likely falls in — scored with item response theory, which weighs how hard each question was. Always free to see.
16 kinds of puzzle
Matrices, figure series and analogies, number series, grids and analogies, rotation, mirror and water images, paper folding, cube nets, odd one out, hidden figures, counting shapes and working memory.
Adapts to you
24 questions in 20 minutes, or a 10-question quick test. Get one right and the next is harder; miss one and it eases off. New puzzles every time — you can’t memorise the answers.
Daily puzzle & leaderboards
One new puzzle a day, the same for everyone, and a streak to keep. Leaderboards for the full test, the quick test and today’s fastest solve — every score re-checked on our server.
Practise every skill
Pattern logic, number logic, spatial, visual reasoning and working memory at eight levels, with hints on request and the rule explained after every answer.
No ads, no paywall on your score
No ad networks and no advertising ID. Optional one-time extras (a full report, practice packs, a lifetime pass) — no subscriptions, no timers, no “today only” pressure.
What makes it different
Most IQ test apps make you pay to see your result. Ninth Cell shows it for free, every time, with an honest range instead of a single magic number — and it says plainly that a 20-minute test is an early estimate, not a verdict.
Every puzzle is generated by code from logic rules, then checked by an independent solver to make sure it has exactly one correct answer before you ever see it. Thousands of puzzles per level means a retest is a genuinely new test.
The questions are pictures and numbers — no trivia and no vocabulary — so the test is fair whatever language you speak. It works offline, with no account.
The modes
- Full test — 24 adaptive questions, 20 minutes, all five skills.
- Quick test — 10 questions in 8 minutes.
- Today’s puzzle — one a day, the same for everyone, with a streak and a fastest-solve board.
- Practice — any skill, eight levels, every rule explained.
- Full report — your score by skill, every missed question explained, and what to practise next.
A note on the score
Ninth Cell gives an estimate of reasoning ability for curiosity and practice. It is not a clinical or diagnostic IQ test and must not be used for hiring, school admission or medical decisions. Players under 16 get a practice score that is never placed on leaderboards.
Get update alerts
New puzzle types and features ship regularly. Drop your email and we’ll tell you when the next one lands.