Here’s a game. It only has one rule, but you also need to know how to set it up. The headings that follow are taken from Monopoly.

SETUP

Take some coins. Shake them up, and spread them on a flat surface. Flatness isn’t that important. But you don’t want the coins to be sliding around – a sticky surface would work too.

PLAYING THE GAME

Keep doing this: Pick any pair of adjacent coins. If one of them is ‘heads’ and the other is ‘tails’, turn one of them over so they both agree (this is the persuasion).

WINNING THE GAME

If you notice that heads and tails are clustering, you’re winning. And, if you’re using thousands of 3-sided coins, whose sides are coloured black, red and white, and you see a pattern like the picture up there on the right, that’s good too.

RULES FOR A SHORT GAME

Just click here for a Processing sketch which takes millions of turns per minute.