I do second Brunei. I also want Croatia to be added. There's a small area of Bosnia cutting into the Croatian coast, splitting it in two. Also, why do you include only large exclaves? any exclave of a country will be visible on the map if you zoom in on it, so why not make this quiz a bit challenging and include them all?
I will add Brunei. I feel like Croatia seems too small to be added. The largest of the Croatia-Serbia enclaves is tiny, and the Bosnia-Croatia enclave is hard to see on a Europe map, let alone a world map