The Math Behind Everything All games

Improbable

Can you guess it?

Fifteen levels of guessing the outcome, each less likely than the last: from calling a coin (1 in 2) to calling 20 flips in a row (about 1 in a million).

How it works
  1. Each level is one guess: a coin, a die, a card, a roulette number, a total, or a few of them in order. Tap your pick and it plays right away.
  2. Try as many times as you like. A hit beats the level and opens the next one, and the level keeps how many tries it took you.
  3. Every result is drawn fresh and fair in your browser. Your progress stays on this device. Nothing here is a bet or a prize.
How the math works

From 1 in 2 to 1 in a million

Every level is a single guess. Its odds are how many results match your pick out of every result that could come up, multiplied across each coin, die, card or spin.

      How long 20 flips in a row takes

      Every coin, die, card and spin is drawn with your browser's cryptographic random generator, so each result is fair and independent. Nothing on this page is a bet or a prize.

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      For education and entertainment. Found a mistake in the math? Email me and I'll fix it.