Colour the Grid Test
Learn the hidden colouring rule from symbol examples, then colour the target symbol.
Frequently Asked Questions
Have another question? Let us know.
How do I learn the rule from the examples?
Compare the symbols with their colours. The rule always splits the symbols into two groups — such as odd versus even digits — and gives each group its own colour. The examples show both groups, so the rule can always be inferred.
How is my score calculated?
You get one point for each correct answer. Wrong answers are penalized by one third of a point to discourage guessing, matching the formula scoring used in many aptitude tests.
Are the questions the same every time?
No. Every attempt generates fresh examples from four rule families — odd/even, high/low, prime, and vowels — so you can practice as many times as you like.
What happens if the 5-minute timer runs out?
Your test is submitted automatically and your results are calculated from the questions you answered, just like a timed screening test.
About This Challenge
This is an independent practice experience for self-improvement. It is not a professional aptitude assessment and is not affiliated with any employer or assessment publisher.
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Why rule-colouring challenges matter
Colour-the-grid tasks train rule induction — inferring a classification rule from examples and applying it to a new case.
Odd or Even
Even digits get one colour and odd digits get the other.
High or Low
Digits 0–4 get one colour and digits 5–9 get the other.
Prime or Not
Prime digits (2, 3, 5, 7) get one colour and the rest get the other.
Vowel or Consonant
Vowel letters (A, E, I, O, U) get one colour and consonants get the other.
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