A 45-second game of arithmetic, probability and surprising number sense.
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45s Time Attack
Judge as many numerical expressions quickly and accurately within 45s.
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Combo bonus
Three consecutive correct answers apply 1.5×; five apply 2×.
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Your game scorecard
Share your score and revisit the ideas behind your answers.
The daily question sequence is shared worldwide using UTC. A shared link replays that sequence. Scores depend on device and response speed; they are not verified rankings.
Keyboard: ← / ↓ (equal) / → · 1 / 2 / 3 · O / X
Time Left45
Combo0x
Score0
Round complete
Time is up! Your game results
Final Score0
Accuracy0%
Avg Speed0.0s
Your shareable scorecard
How scoring works
A correct answer earns 100 base points plus a speed bonus. Three consecutive correct answers apply a 1.5× multiplier; five apply 2×. A wrong answer resets the combo. The round ends 45 seconds after it starts, including time in another tab.
S+ requires 2,000 points and 85% accuracy; A requires 1,400 and 75%; B requires 900 and 60%; C requires 400 points. Otherwise the tier is D. These are game thresholds, not IQ scores or population rankings.
Controls and learning
Use the arrow keys for comparisons (↓ means equal), 1/2/3 for missing numbers and O/X or 1/2 for true/false. Tap buttons on mobile. Review explanations for intuition questions you missed, then try an untimed experiment. Your answers are not stored on our server.