What does fluid intelligence mean?
Fluid intelligence is the ability to reason through a problem you have not learned to solve before. You might compare shapes, look for a rule, and use that rule to choose what comes next. The task calls on you to work things out from the information in front of you.
Crystallised intelligence refers to knowledge and skills you build through learning and experience. Knowing a word’s meaning or recalling a learned method relies more on what you have already acquired. Real tasks can use both: knowledge can help you understand a problem, while reasoning helps you handle a new part of it.
Which tasks test fluid reasoning?
Matrices, series, spatial rotation, and deduction tasks can sample fluid reasoning. In a matrix puzzle, you look across or down rows of shapes to infer a rule. In a series, you identify how numbers, letters, or symbols change from one item to the next.
Rotation tasks ask you to picture how a shape would look after it turns. Deduction problems ask you to draw a conclusion from stated rules. These tasks suit fluid reasoning because they present information to inspect and ask you to infer a relationship or result. They do not require a single body of specialist knowledge, though familiarity with puzzle formats can make the instructions feel easier.
What can a fluid reasoning score tell you?
A fluid reasoning score describes how you performed on those tasks under particular test conditions. It does not describe every form of intelligence or tell you how well you will do in every class, job, or everyday situation. A timed result also reflects how you handled the time limit.
An IQ score from a normed test has a different basis: it compares performance with a large group tested under the test’s rules. A puzzle score by itself is not that comparison. Read more about what IQ tests measure and how IQ tests work to see how broader scores are constructed.
What does the IQClock test measure?
The IQClock test samples fluid reasoning only. A full test uses form A: 30 puzzles, 25 minutes. It covers matrices (12), number and letter series (6), spatial rotation (6), logic: ordering and syllogisms (6), in a 30-puzzle form. These areas sample different ways of spotting relationships, applying rules, and drawing conclusions.
IQClock prints no IQ number or population percentile because an IQ is a rank against a large tested group, and the site has not tested such a group yet. The result shows correct answers, time used, the likely range on a retest, the score you would get by guessing, the hardest level solved reliably (levels 1 to 5), and the score in each area. The test is free, with no sign-up, no email, and nothing paid at the end; every answer can be reviewed with its explanation.
Does practice change performance on these tasks?
Practice can help you recognize how a puzzle is set up and get used to checking possible rules. That can reduce time spent figuring out the instructions, but it does not mean every reasoning task will feel familiar or that a practice result predicts a normed IQ score.
IQClock has 115 puzzles, all generated by our own code; 40 of them are practice puzzles in 5 sets of 8. Try the practice puzzles to learn the formats before taking the test. Treat practice as a way to understand the tasks, not as a promise of a particular result.