IIF Certified Assessment
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IIF Certified Assessment
A reasoning puzzle every day with the full working shown, plus honest coverage of what brain-training products can and cannot do.
A syllogism gives you two statements and asks what must follow. Decades of research show most people answer with what they already believe instead — and the fix is one simple substitution trick.
Four items share a rule and one breaks it, but only if that rule is the only sentence that fits. When a second, equally valid rule points at a different item, the puzzle is testing which distractor you noticed first, not how well you reason.
Two item types dominate the spatial section of a cognitive battery, and both were built on a finding you can reproduce on yourself: the time it takes to decide whether two shapes match rises in a straight line with how far apart they are rotated.
The test returns a raw count of correct items, not an IQ. Everything the number means arrives later, from a norm table that expires faster than almost any other test's.
Every analogy item asks the same thing twice. Name the relation between the first pair in a single sentence, then find the pair that takes the same sentence — and the plausible-looking wrong answers stop being tempting.
A follow-up published in February 2026 tracked 2,802 adults for two decades after five weeks of cognitive training. One of the three training arms showed a lower rate of dementia diagnosis. The other two showed nothing.
Number series items are not solved by inspiration. They are solved by a short, finite list of checks run in a fixed order — and by the standard a matrix item demands: if the rule cannot be said in one sentence, it is the wrong rule.
Three rows, three columns, two things changing at once. The worked solution is below — and so is an honest account of what solving it does and does not tell you about yourself.
An IQ figure is meaningless without the scale it was measured on and the range around it. Every story here reports all three, or says plainly that the source did not.
Each story ends with the studies, datasets and documents it draws on, named and attributed, so you can go and read them yourself.
Spotted an error? Write to corrections@iqmetrics.org. Corrections are made on the story and noted at the bottom of it — never quietly.
Our IIF-certified assessment reports your score with its scale, percentile and confidence range — and a breakdown of the cognitive domains behind it.
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