No idea what’s going on here, really. You move your black tile on to white tiles to earn points – the faster you move, the faster your time runs out, but the more points you score. Every now and again tiles of other colours pop up and give you extra points or reverse the colour of the board, or something.

Koan

I have no idea why I sometimes get thousands of points and sometimes almost none.

It all seems really rather random and if there’s any real strategy, I can’t see it. It is, however, bizarrely compelling, in a weird way. And, you know, it was free, which is always a bonus.