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🔍Think Clearly: Logic & Critical Thinking
Level 1Free
Thinking That Can't Be Fooled
In the age of AI, there's more information than anyone can read and it's hard to tell true from false; the ability to think things through is rarer than the ability to memorize answers. This level builds the basic thinking skills that keep you from being misled.
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Level 2
The Skeleton of an Argument
Learn to see what a passage is actually arguing: find the conclusion, spot the reasons, and tell deduction apart from induction.
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Level 3
Subtler Mental Traps
Learn to spot the harder-to-notice fallacies and mental biases, so they don't quietly throw you off in everyday decisions and debates.
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Level 4
Critical Thinking in Action
Put critical thinking to work in the real world: read data clearly, weigh up "the experts say," and learn to discuss problems reasonably.
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Test yourself first (free, no sign-up)
Logical Fallacy Quiz: Can You Spot the Flawed Argument?
12 arguments — can you spot the trick behind each one?
Cognitive Bias Quiz: Which Mental Traps Fool You?
12 everyday moments — which mental trap fools you?
Deductive vs Inductive Reasoning: What's the Difference?
Top-down or bottom-up? Call it right on 12 real arguments.
LSAT Logical Reasoning Flaw Questions: Free Practice Quiz
12 LSAT-style flaw questions · 5 choices each · full explanations
Assumption Questions: LSAT & GMAT Practice Quiz (with the Negation Test)
Find the load-bearing wall the argument never mentions.
Strengthen & Weaken Questions: LSAT & GMAT Practice Quiz
Find the gap first. Then decide: patch it or pry it open.
Method of Reasoning Questions: LSAT & GMAT Practice Quiz
Describe the move. Do not grade it.
Free Logical Reasoning Test: 12 Practice Questions with Answers
Judge only what the passage says. That one rule is most of the test.
GRE Analyze an Argument Was Retired in 2023 — What to Practice Instead
The essay is gone. The skill still gets tested.
Correlation vs Causation Quiz
Correlation whispers; causation has to prove itself.
Necessary vs. Sufficient Conditions Quiz
Hurdles are not guarantees. Arrows have directions.
Base Rate Fallacy Quiz: Can You Beat the Denominator?
Positive ≠ sick, alert ≠ fraud — see if the denominator fools you.