MindProofWhich number completes the sequence?
−3 → 2 → 9 → 18 → 29 → ?
Answer: 42
Add consecutive odd numbers: +5, +7, +9, +11, then +13. 29 + 13 = 42.
MindProof
Free IQ-style reasoning test
Five quick reasoning questions. No signup required. An instant result, with an explanation for every answer.
This short preview reports answers correct out of five. It does not calculate an IQ score.
What this test measures
Five questions sample the same four kinds of reasoning the full MindProof assessment explores. Five questions cannot profile you — they give you a feel for each kind of thinking and show you the reasoning behind every answer.
- Pattern. Spot the rule hiding in plain sight.
- Spatial. Turn shapes around in your mind.
- Numerical. Find the relationships between numbers.
- Logic. Follow the clues to a sound conclusion.
How it works
- Try five questions. A short, untimed web preview.
- See what you solved. Your score and an explanation for each answer.
- Explore more in the app. Full tests, practice, games and friend duels.
5 questions · No signup · Instant result
Example puzzles, with the reasoning explained
These are real puzzles from the MindProof collection, shown here with their answers so you can see the level and the style of explanation before you start. The five questions in the test are different ones.
A square has corners A, B, C, D in clockwise order. Starting at A, move clockwise by six corners. Where do you finish?
Answer: C
Four moves bring you back to A. Two more take you through B to C.
A lamp starts off. Each press changes its state. You press the switch 17 times, then 8 more times. Is it on?
Answer: On
There are 25 presses. Every pair cancels out, leaving one press: the lamp is on.
What your result means — and what it does not
Your result is simply the number of questions you answered correctly, out of five. It is not converted into an IQ score, a percentile or a grade, because five questions cannot support that kind of claim.
There is no norming sample behind this web preview, and no diagnosis or certificate. Familiarity with puzzles, the language you are reading in, tiredness and a second attempt can all change the number. Treat it as a prompt for curiosity, not as a label for your abilities, and never as a basis for educational, employment or medical decisions.
Questions people ask
Is this a real IQ test?
No. It is a five-question reasoning preview. It reports how many you answered correctly and does not calculate an IQ score, a percentile or a grade. The full 30-question assessment in the app produces an estimate, and even that is not equivalent to a professionally administered standardized test.
How long does it take?
Usually two to three minutes. There is no timer, so you can take as long as you want on any question.
Do I need an account?
No. There is no signup and no email. Your answers stay in your browser tab, are not submitted to a score database, and disappear when you reload or close the page.
Can I take it more than once?
Yes, but this web preview uses the same five questions every time, so a second attempt reflects familiarity as much as reasoning. If you want fresh material, the daily puzzle and the puzzle collection change independently of this test.
Where to go next
If you want more reasoning practice, these are free and need no account: