No pressure. Just a little practice.
Good intuition takes practice.
Look. Guess. Discover. Get a little closer every day.
Five little experiments
0 pts
BasketballsCount the objectsWarm-up
15s
Filling up with curiosity…
Left jarRight jar
Drag to explore
Let your intuition take it from here.
Time to guess. Enter your estimate below.
How many are in there?
Your guess—
Actual count—
Relative error—
Your rounds, at a glance
Your guessActual count
Progress saved automatically. Come back anytime.
A little more curiosity?
No pressure, no limits. Something new in every round.
How to play
Choose the container with more objects, then estimate the difference. Volume is not the same as count. How sharp is your eye?
Each round scores 100 × max(0, 1 − absolute error / max(answer, 10)), rounded to a whole number. Practice is unlimited and does not change your daily record.