[Swizec]

How do you calculate accuracy? Sometimes I clicked in almost the opposite corner of the ball and it said I did better than 80% of readers.

Are you just calculating how close my guess is to the most densely clicked spot even if the ball is not actually in that spot?

[_alastair]

The accuracy is calculated compared to other readers, so if you all clicked on the wrong corner you can still be better than 80% of them!

I mostly did it this way because there's no hard number that makes sense here - we don't know ft/metres, and pixels aren't a unit everyone is used to thinking about.