Marble Run

What it is

A day at the marble races. Six marbles, an odds board that misprices them by reputation, and you pick one per race against the crowd. Reading the odds beats guessing, but not by as much as you would hope, which is about right for gambling.

How it works

Pick a marble before each race. Watch it run on real physics. Collect your points across the day and see if you beat the crowd.

• The marbles move like marbles; a floaty gravity bug was measured and fixed against a real 22 mm marble
• Reading the odds scores about 57 a race against 37 for blind picks, over 100 simulated races