About the tests
Intuition Rank holds six short tests. Two of them measure nothing about you at all, and four measure something small but real. The site tells you which is which, on every card, before you start. That honesty is the whole design: a test that flatters everybody is worthless, and a guessing game that pretends to read your mind is worse than worthless.
The two guessing tests
Colour Sense
Several shapes appear, one of them is a named colour, and you pick. The catch is that every shape has been rendered at the same brightness before the colour was removed. That is not a figure of speech. Each option’s lightness is tuned by the site until its luminance matches the others to within a fraction of a percent, using the same weighting your browser applies when it desaturates an image. All the panels come out as the identical grey.
This matters because the obvious way to build this game is broken. Take two photographs, one of a red balloon and one of a blue one, and desaturate both: the blue one comes out darker, every time. A player who notices that is not using intuition, they are reading a brightness cue, and the “intuition test” has quietly become an eyesight test. Removing the cue is what makes the score mean anything.
The result is that your odds are exactly one in two or one in three, and nothing you do can change them.
Zener Cards
Five symbols — circle, cross, waves, square, star — drawn twenty times. This is the actual instrument J. B. Rhine used in his parapsychology experiments at Duke University in the 1930s, and it is included unchanged because it is the most recognisable intuition test that exists.
Each card is fixed by the site before you choose and is never altered afterwards. Pure chance scores four out of twenty. Nine or more happens by luck to roughly one player in a hundred, which sounds remarkable until you remember how many people are playing.
Why your score is compared to chance
A result of seven out of twenty feels like something. It is not: chance produces four, and seven is an ordinary Tuesday. So instead of a grade, the result screen tells you where your score sits among random guessers, and how often luck alone reaches it. The number comes from the binomial distribution — the same arithmetic you would use on a run of coin flips.
Run either guessing test enough times and your average will settle onto the chance line. That is not the site being stingy. It is what a fair coin does, and any site telling you otherwise is selling something.
The four tests that measure something
- Hidden Object — visual search under time pressure. Genuinely trainable, and the improvement between a first and third attempt is usually obvious.
- Odd One Out — pattern logic. Every puzzle is generated from a rule rather than pulled from a fixed set, so there is nothing to memorise.
- Memory Flash — working memory span, from four items up to nine. Nine is beyond most people; that is deliberate.
- Blink — subitizing, the sense of number that operates faster than counting. Up to about four items nearly everyone is perfect. Past that, counting is impossible in the time given and everybody estimates. This one feels the most like intuition and is the most measurable of the six.
What this is not
It is a set of games. It is not an IQ test, not a psychological assessment, not a diagnosis of anything, and not evidence for or against the existence of intuition as a sixth sense. Nothing here should be used to make a decision about your health, your education or your career. If a score bothers you, the correct response is to play again and watch it move.
Questions, or a bug in one of the tests: hi@parallelugc.com.