How sharp is your reasoning?
Six IQ-style questions that test patterns, relationships and logic, from easy to hard. There's no score in IQ points here — just a fun way to stretch your thinking, with every answer explained.
Did you know?
- The first practical intelligence test was created in 1905 by French psychologists Alfred Binet and Théodore Simon. It was designed to identify schoolchildren who needed extra help, not to rank people's overall worth.
- Average IQ scores rose by roughly three points per decade in many countries during the 20th century. This is called the Flynn effect, after researcher James Flynn, and is linked to better education, nutrition and health.
- IQ tests are designed so that the average score is 100. About two-thirds of people score between 85 and 115, and scores are regularly re-calibrated as populations change over time.
What IQ-style questions really measure
IQ tests try to measure reasoning skills such as spotting patterns, understanding relationships and solving new problems. This short quiz uses the same types of questions, but it is designed for fun and practice rather than to produce a real IQ score. Scientific IQ tests are longer, carefully standardised and given under controlled conditions by trained professionals.
Pattern recognition
Many IQ questions ask you to find the rule behind a sequence. The trick is to test simple ideas first: is the same number being added, are the gaps changing, or is each number related to its position? Writing down the differences between numbers often reveals the pattern quickly, as in the 2, 6, 12, 20, 30 sequence.
Analogies and relationships
Analogy questions such as 'bird is to nest as bee is to...' test whether you can identify a relationship and apply it to something new. Good strategy is to state the relationship in a full sentence — 'a nest is where a bird lives' — and then complete the same sentence for the second pair.
Why intuition can mislead
Some questions are designed so that the first answer that comes to mind is wrong. In the machine problem, many people answer 100 minutes because the numbers seem to grow together. Slowing down and working out the rate for one machine avoids the trap. Psychologists use such questions to study the difference between fast and careful thinking.
Can you improve at these puzzles?
Practice with puzzles usually makes people better at that type of puzzle, because they learn the common tricks and strategies. Whether this raises general intelligence is debated among researchers. What is clear is that puzzles train useful habits: checking assumptions, looking for patterns and explaining your reasoning step by step.
A healthy view of IQ
IQ scores describe certain thinking skills, but they do not measure creativity, kindness, practical skills, motivation or many other qualities that matter in life. Scores can also be influenced by education, language and familiarity with test formats. That is why psychologists treat IQ results as one piece of information, never as a complete picture of a person.