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Logic Lab10 units · 77 lessons · self-paced

Logical reasoning practice that explains itself

Logic Lab is about what follows from what. It begins with the difference between must, might and can’t, then moves through if-then rules, chains of facts, deduction puzzles, the words logic turns on, arguments, causes and chance. When you get one wrong, it shows you exactly which step went astray.

Start learning ReasoningSee all 10 units

What you will practise

  • Must, might, can’t

    Telling what has to be true from what only could be.

  • If-then rules

    Using a rule correctly, and not running it backwards.

  • Deduction

    Chaining facts and solving grid and ordering puzzles one certain step at a time.

  • Arguments

    Spotting the hidden assumption, and the reason that does not actually support the claim.

  • Causes and chance

    Separating cause from coincidence, and weighing how likely something really is.

Try one

From Unit 1, exactly as it appears in the app. In a lesson you would tap your answer and hear why it works, or why not.

Hana is faster than Ben. Vik is faster than Ben too. Is Hana faster than Vik?

  1. You can’t tell from this
  2. Yes: Hana was named first
  3. No: both are faster than Ben, so equal
Show the answer

You can’t tell from this

Both orders fit, so the facts don’t settle it: you can’t tell. A fact about two people says nothing about a third, and can be said from either side.

The 10 units

In order, from the first step to the hardest. Each unit is a set of short lessons.

  1. 1Must, Might, Can’t6 lessons
  2. 2If, Then8 lessons
  3. 3Chains and Orders7 lessons
  4. 4Deduction Puzzles9 lessons
  5. 5Words of Logic7 lessons
  6. 6Arguments8 lessons
  7. 7Generalising and Testing6 lessons
  8. 8Causes9 lessons
  9. 9Chance and Belief7 lessons
  10. 10Weighing It All10 lessons

How a lesson works

  1. Step 1

    See the idea

    A lesson opens by showing you one idea, worked through step by step.

  2. Step 2

    Use it yourself

    Then it is your turn. A wrong answer tells you why, and hints come one at a time.

  3. Step 3

    Keep it

    Ideas come back in later lessons and in your daily workout, so you keep using them.

Questions about Reasoning

What is logical reasoning?
Working out what must follow from what you know, and what does not. It is the skill behind solving puzzles, checking an argument, and not jumping to a conclusion.
Will it help with reasoning tests?
The lessons practise the same kinds of thinking that verbal and logical reasoning questions use, such as rules, orders and what must be true. We do not promise a score: it is practice, not a test-prep course.
What happens when I get one wrong?
You are told why that answer does not work and can try again. Hints come one at a time, and the full answer is shown only if you ask for it.
Do I need an account to start?
No. You can start as a guest, and your progress is kept in your browser on that device.

The other worlds

Start Logic Lab today

Weigh the claim before you believe it. No account needed to begin.

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