PrismaTest
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Logic Test: 12 Puzzles To Test Your Reasoning

Twelve random reasoning puzzles, from number sequences and syllogisms to famous intuition traps, with a worked solution after each one.

  • 12 questions
  • About 6 min
  • Free, no sign-up
  • Based on original reasoning puzzles with solutions

12 questions, about 6 min

Twelve reasoning puzzles drawn at random from 24: number sequences, word logic, syllogisms and quick lateral thinking. No knowledge needed, just careful thinking.

Take your time; there is no timer. After each answer you see the solution and how to reach it. Your score and missed puzzles appear at the end.

What The Test Covers

Puzzle typeWhat it testsExample
Number sequencesSpotting patterns3, 6, 11, 18, 27?
Letter sequencesPatterns in the alphabetA, C, F, J, O?
SyllogismsDrawing valid conclusionsAll A are B; all B are C; are all A C?
AnalogiesRelationships between ideasBook is to reading as fork is to…
Intuition trapsSlowing down to checkThe bat and ball problem
Odd one outClassificationWhich number is not prime?

Each game picks 12 puzzles at random from a pool of 24. No special knowledge is needed.

How It Works And How It Is Scored

There is no timer. After each answer you see the solution and how to reach it. At the end you get your score and the puzzles you missed.

ScoreRating
0% to 40%Warming up
41% to 65%Solid reasoner
66% to 85%Sharp logical thinker
86% to 100%Logic master

Why Some Questions Feel Easy But Are Not

Several puzzles come from research on “fast and slow” thinking. Psychologist Shane Frederick’s Cognitive Reflection Test (2005) showed that many people, including students at top universities, answer quick questions like the bat and ball problem incorrectly because the first answer that comes to mind is wrong. Daniel Kahneman popularised the idea in Thinking, Fast and Slow (2011): our fast, intuitive System 1 jumps to an answer, and only the slower, effortful System 2 checks it.

The lesson: when a puzzle seems too easy, pause and check.

Sample Puzzle

A bat and a ball cost 1.10 together. The bat costs 1.00 more than the ball. How much is the ball?

0.05. Most people say 0.10, but then the bat would cost 1.10 and the total 1.20. With the ball at 0.05, the bat is 1.05 and the total is 1.10.

Is This An IQ Test?

No. Real IQ tests are standardised on large population samples and taken under controlled conditions. This test is a fun reasoning challenge. Your score shows how many puzzles you solved, not how you compare with the general population.

Frequently Asked Questions

How can I get better at logic puzzles?

Practise regularly, write things down, and check your first answer before committing. Most improvement comes from learning common puzzle patterns.

Is there a time limit?

No. Take as long as you need.

Are the puzzles random?

Yes. Each game picks 12 from a pool of 24.

More Brain Tests

Apply logic to real-world arguments in the critical thinking test, or test what you know with the general knowledge quiz.