Why an IQ score needs a norm sample
An IQ score compares a person's performance with people in the same age group. The average score is 100 for each age group, so a test needs results from a tested group to establish that comparison.
A quiz can count correct answers or measure time, but those results alone do not establish an IQ. Even well-made puzzles cannot show where a score ranks without a suitable norm sample.
What to check before trusting an online test
Start by checking who made the questions and how they verified the answers. Look for a description of the norm sample and whether it includes the ages the test compares. If the site does not explain this, it has not shown how its number maps to an IQ score.
Also check how the result is presented and what you must do to see it. A result held back for an email or payment is a reason to look closely at the test's methods. A falsely exact number can imply more certainty than the method supports, while a range makes uncertainty visible. You should be able to review your answers and see what the test measured.
How IQClock checks its puzzles
IQClock creates its puzzle bank with its own code and checks whether each puzzle has one correct option. A separate program checks the answer keys, then a second model solves every puzzle without the key. Each disagreement is checked by hand or by script.
The full test uses form A: 30 puzzles, 25 minutes. It covers matrices, number and letter series, spatial rotation, and logic. It is free, requires no sign-up or email, and has nothing paid at the end. Every answer can be reviewed with its explanation. See how the test is made and scored.
What IQClock reports and what it does not
IQClock reports puzzle performance rather than an IQ score. Its result shows correct answers, time used, the likely range on a retest, the score you would get by guessing, the hardest level solved reliably, and the score in each area.
IQClock has not tested a large group to establish norms, so it prints no IQ number or population percentile. A likely retest range describes possible variation on another form, not a normed IQ range. For more on how normed tests work, read how IQ tests work.