About

Mibby is a free daily estimation game. Everyone gets the same three big-number questions, one guess each, and 60 seconds per question. Faster and closer guesses score more.

How scoring works

A perfect guess is worth up to 1,000 points. Accuracy determines the base score. Answer within the first 15 seconds and you keep every point; after that your score shrinks steadily, down to 50 percent at 60 seconds. Your three question scores add up to 3,000.

Full details

a = max(g / A, A / g)

acc(a) = round(1000 × max(0, 1 − log10(a) / 2) ^ 1.5)

speed(t) = 1.0 if t ≤ 15

speed(t) = 1.0 − (1 − 0.5) × (t − 15) / (60 − 15) otherwise

question_points = round(acc(a) × speed(t))

: ≤ 1.25×
: ≤ 3×
: ≤ 5×
: ≤ 20×
: > 20×
: —

The estimation-game idea is credited to physicist Enrico Fermi.

Fair play

Stay on the question page while the clock is running. If you leave during a question, your score still counts for you and your friends, but the run stays off the Global and Squad boards.

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