Two countries are marked on the map. Type the countries that lie between them, moving only across real land borders, in as few guesses as you can. The game shows the optimal number of steps, so you know how close to perfect your route is.
On Easy the whole map is visible; on Hard only the two ends are shown and each country appears once you name it. It is a good way to learn who borders whom, which is the knowledge most geography questions quietly depend on.