Culture fair IQ test practice

The idea behind culture-fair testing

Many traditional test questions quietly test what you have been taught. A vocabulary item rewards reading, an arithmetic word problem rewards schooling, a general knowledge item rewards growing up in a particular place. A culture-fair test tries to strip those out and leave only the reasoning: here is a pattern you have never seen, work out its rule.

That is close to what Raymond Cattell meant by fluid intelligence, reasoning with novel material, as opposed to crystallized intelligence, the knowledge you have built up (Wikipedia: Fluid and crystallized intelligence). Matrix puzzles are the classic tool: Raven's Progressive Matrices, first published in 1938, are widely used as a measure of fluid, culture-reduced reasoning (Wikipedia: Raven's Progressive Matrices).

What is in this practice set

Every question above is a shape puzzle generated by the IQ Octopus engine. The only language on screen is the short prompt, and the only counting is small numbers of shapes or sides. The set runs from easy to hard:

• Four 3x3 matrices. Rules run across rows and down columns. Look for a value that steps along each row, three values that each appear once per row and column, or line patterns where only the unique lines carry over.
• Three sequences. A row of tiles changes by a turn, an added shape, a size step, a fill cycle or a dot moving around the edge. Compare neighbors, then extend.
• Two odd-one-out sets. Five figures share either a side count or a dot position relative to two outlines; one does not. Ignore size, tilt and fill.
• One figure analogy. Name every change from the first panel to the second and apply exactly those changes to the third.

How to approach shape-only puzzles

With no words to anchor you, it helps to put words back in. Describe each tile to yourself in a short phrase: “two hatched squares, large.” Then describe the change between tiles the same way. This sounds slow, but it is faster than staring, and it catches the most common error, which is noticing one rule and missing a second. When you reach the options, you are matching a sentence, not a vague impression.

Two more habits help on this format. First, read rows and columns on every matrix, because some rules only show up in one direction. Second, on odd-one-out sets, say the shared rule out loud before you pick. If you cannot say it, you have probably found a figure that only looks different.

A worked matrix, described in words

Here is how the describe-it habit plays out. Row one: one hatched circle, two hatched circles, three hatched circles. Row two: two solid squares, three solid squares, four solid squares. Row three: three outlined triangles, four outlined triangles, and a gap. In words: across each row the count goes up by one; each row starts one higher than the row above; each row has its own shape and fill. So the gap holds five outlined triangles.

Among the options you would expect five solid triangles (fill wrong), four outlined triangles (count wrong) and five outlined squares (shape wrong). With the sentence in hand, each one fails in a second.

A note on scales: why 132 and 148 can mean the same thing

If you are comparing scores, the scale matters more than the test's name. Modern clinical tests such as the Wechsler scales use a standard deviation of 15. The Cattell Culture Fair III scale uses 24, so the same percentile prints as a different number (Wikipedia: IQ classification). Mensa UK, for example, quotes qualifying scores of 148 on Cattell III B and 132 on the Culture Fair test, and both are the 98th percentile on their own scales (Mensa UK). Before comparing two scores, convert them; the percentile to IQ converter shows all three common scales.

Pacing the set

You have 30 seconds per puzzle, with a ring that counts down, and five minutes at most for all ten. If the ring empties the puzzle is recorded as unanswered and the next one loads. Easy items should take ten to fifteen seconds. Bank that time mentally, but you cannot carry it over, so on the last two matrices use the full 30 seconds and commit to an answer before it runs out.

What your practice score means, and does not

The result is a count out of ten with a plain description of that practice performance. It is not a Culture Fair score, not an IQ, and not convertible to either. Published tests are normed on large samples; this set is not. Its value is diagnostic: which formats felt natural, which rule types caught you, and whether the clock was a problem.

Practice and the limits of fairness

Culture-fair is a goal, not a guarantee. One reason is familiarity: people who have done many puzzles like these do better on them. Retaking cognitive tests raises scores by about a quarter of a standard deviation on average, roughly 4 IQ points, and more on the same form (Hausknecht et al., 2007). That gain is about the format, and it is one more reason a short practice set is useful before a test that counts: it puts you on more even footing with people who have seen the format before.

The guide to culture-fair IQ tests goes further into where the idea came from and what it can promise. For more matrices, the Raven's matrices practice test is all grids.

An estimated IQ, culture-fair style

The full IQ Octopus test follows the same principle: shape puzzles in four of its five sections, plus a short number series section. It generates fresh items for every attempt and reports an estimated IQ on the standard deviation 15 scale, with a confidence range.