- 3SmartCubes.com
 - Offers online PhD-certified IQ, personality, and other self-assessment tests.  BBC: Test the Nation
- Contains information on the national IQ test from the BBC. Register to take part online or download a scorecard to take part at home.- Brain Metrix
- Features online IQ tests, Mathematics games, brain concentration test, and exercises for IQ boosting and mind training.
- Cerebrals Online Intelligence Tests
- Intelligence tests designed by the Cerebrals Society, measuring qualities like cognitive ability, creative thinking, inductive reasoning, and mental performance. Fee required for most tests.
- Classical Intelligence Test
- Assesses your intellectual potential as a logical thinker, a numerical whiz, a verbal genius, or a visual virtuoso. Registration required.
- Comar IQ Tests
- Intelligence Test
- Standardized, online scored test assessing several aspects of intelligence. Reliability and validity data are posted on the site.
- International High IQ Society: Free IQ Tests
- Offers five IQ tests, each measuring a different type of intelligence. Test just your verbal or cultural IQ, or, if you think you're really smart, try the Test for Exceptional Intelligence, which measures IQ scores up to 180.
- IQ Paradise
- Lots of frequently updated IQ tests for all to attempt.
- IQ Test Labs
- Offers a free IQ test with a ten minute timer. Automatically displays results and statistics including your percentile score.
- IQ Test Page, The
- Offers a 30 minute online IQ test that reports the final score and testing results automatically.
- IQ Testing Online
- Measure your brainpower and cognitive ability with a standardized IQ test. Results are displayed in an analytical report with categorical rankings and access to questions answered incorrectly.
- IQTest.com
- Online IQ testing that aims to be fast, accurate, and fun. Measure your brainpower against other people your age. Includes both free and fee-based tests.
- IQTest.dk
- IQ test available in both English and Danish utilizing visual shapes to test learning, memory, innovative thinking, and problem solving.
- IQTest.sk
- Offers a variety of challenging IQ tests including mathematical, logical, pictorial, visual, and mixed assessments. Also available in Slovenian.
- Majon's IQ test
- Offers a variety of IQ tests, plus test preparation assistance.
- Mensa Workout, The
- A 30-question quiz to test your intelligence from Mensa. Mensa is a social society with the aim to identify and foster human intelligence.
- Puzz.com
- Offers IQ tests, puzzles, riddles, and other conundrums, humour, high IQ society information, games, and more.
- Queendom: IQ Tests
- Collection of intelligence, logic, and memory tests.
- Quick IQ Test
- Offers an IQ test that will explore your intelligence quotient in a few minutes.
- SON-R Nonverbal Intelligence Tests
- Includes an overview and statistics.
- Test the Nation: What's Your IQ?
- Live Fox television event that allows every person in the U.S. to determine his or her IQ score. Take the test online.
- Test Your IQ
- Test your IQ! Look over the sample questions and answer 60 questions in 45 minutes.
- TestCafe: The Detailed IQ Test
- Find out your IQ with this 32-question test. Get a basic score free, or purchase a detailed intelligence report.
- Uncommonly Difficult IQ Tests
- Links to tough IQ tests like the Mega Test, Hoeflin Power Test, and Titan Test.
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