119 tests · 11 categories
Math & logic tests
Every test starts with a short course and ends with a quiz. Missed questions come back with the right answer and why it is right. No account and no timer.
10 tests
- Easy
Mental math sprint
Arithmetic you should be able to do without reaching for a calculator.
8 questions5 min - Hard
Logic puzzles
Short problems where the obvious answer is usually the wrong one.
7 questions9 min - Medium
Probability basics
Coins, dice and cards, plus the traps that come with them.
7 questions7 min - Medium
Algebra fundamentals
Rearranging, solving and reading what an equation is telling you.
8 questions7 min - Medium
Geometry
Angles, triangles, circles and the handful of formulas worth memorising.
8 questions7 min - Medium
Statistics basics
Summarising data honestly, and knowing what a summary hides.
8 questions7 min - Hard
Calculus intuition
Rates of change and accumulation, explained without the exam technique.
8 questions7 min - Medium
Number patterns
Sequences, series and the rules hiding behind a row of numbers.
8 questions6 min - Medium
Estimation challenges
Getting close on purpose, and knowing when an answer cannot possibly be right.
8 questions7 min - Hard
Deductive reasoning
What follows from what, and the moves that look valid but are not.
8 questions7 min