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Logic & reasoning test online

Logic problems with number sequences: find the rule the row is built on and choose which number comes next. It trains logical reasoning and the ability to spot patterns — right in the browser, against the clock, free and without sign-up. Three difficulty levels: from simple progressions to Fibonacci numbers and interleaved rows.

Level

Spot the pattern in the number row and choose which number continues the sequence. Problems come one after another; a correct answer moves you on instantly. The level changes the type and difficulty of the rules.

2, 4, 8, 16, ?

How many problems people solve per round

Adult guides at the medium level in 90 seconds. A training scale, not an intelligence score.

  • 16 or moreExcellent — you spot patterns fast
  • 11–15Good result — above the typical level
  • 7–10Typical range for adults
  • 3–6Below typical — keep practising, speed grows with practice
  • under 3Slow for now — start with the easy level and build up

What this test trains

Continuing a number row is a classic way to train inductive reasoning: the ability to infer a general rule from a few examples and apply it. This is the core of what people call "logic" and what genuinely helps in analysis, planning and learning.

Unlike "IQ tests", the goal here is not to grade you. The goal is to warm up your thinking and train the speed of pattern recognition: with practice you start to see the rule faster.

How to solve faster

A few tricks:

  • first look at the difference between neighbouring numbers — the rule is often there;
  • if the difference grows — check whether a bit more is added each time (triangular rows);
  • if the numbers grow fast — it is probably multiplication or doubling (geometric);
  • at the hard level, keep in mind that there may be two rows interleaved every other term.

What affects your result

Logic speed depends heavily on your state: sleep loss, stress and fatigue lower it just as they do attention and memory. After rest the result comes back — so compare yourself with yourself, not with others.

A persistent feeling that your mind is "not working" for weeks is a reason to look deeper: B12 and iron deficiency, an underactive thyroid, depression and chronic stress cause "brain fog". This is checked with lab tests.

Frequently asked questions

  • No. It is a logical-reasoning trainer, not an intelligence score. The sequence problems resemble those in IQ tests, but here the goal is to practise and see your progress, not to get an "IQ number". A real intelligence assessment is done in person by a specialist using standardised methods.

  • Look for the rule linking neighbouring numbers: a constant difference (arithmetic), multiplication (geometric), a growing difference, the sum of the two previous terms (Fibonacci), or two interleaved rows. Start with the difference between numbers — it is the most common type. The level sets which rules appear.

  • The speed of pattern recognition and fluency in specific problem types — yes, they improve with practice. This is not "raising general intelligence", but the skill is genuinely useful in study, data work and planning. As with any trainer, regularity matters more than a one-off record.

  • Logic and attention are the functions most sensitive to your state. Sleep loss, stress, anxiety and fatigue noticeably lower the result, and it returns after rest. So one weak round means nothing — look at the trend over several days.

"Brain fog" can come from the body too

B12 and iron deficiency, an underactive thyroid, poor sleep and stress cause brain fog. Upload your labs — AI explains every value and tells you what to check.

Decode my labs

The logic test on this page is a trainer and a reference point, not an intelligence score or diagnostics. Results depend on sleep, stress and fatigue. If your mental clarity has dropped for a long time, discuss it with a doctor.