Each round shows an ordinary, unlabelled political map with one error in it. A country might be missing, mirrored, rotated, the wrong size, nudged out of place, dropped into a sea on the other side of the world, shown twice, or swapped with another. Two neighbours might have had their border erased, or a country might have a fake border drawn through it.

1 point for naming the country that's wrong, and 1 more for saying what the error is. When two countries are wrong (a swap, or an erased border between them), you have to name both. Small island nations are never the ones changed.

Every round starts on the whole world map, so finding the error is part of the challenge. Scroll or pinch to zoom in and drag to pan. Once you've answered, the map zooms to the error.