A city is hidden at the centre of the dial. Each arrow points from it towards a city you can see.
Each day has five hidden cities to find. You have 5 lives for the whole day, and every wrong guess costs one, but it tells you roughly how far the hidden city is from your guess, and in which direction.
Stuck? Show more cities, or measure how far one of them is from the hidden city. You have 5 of each for the day. You can also skip a city, which costs no lives but scores nothing.
Endless mode keeps going, with 5 lives and the same hints for the whole run.
Directions are as they appear on a flat map, so north is straight up.