Another good one. My request for this would be to use the simple CSS needed to change the color of incorrect and correct answers. The red and green don't go to well with the dark background. For red, I suggest going to a darker shade like maroon, and a lighter shade like lime for green.
Cuba was the hardest for me too. I tend to think of its "foot" as being a little more pronounced. The "nose" wasn't hard for me, though I did have to decide between North Macedonia and Sierra Leone.
I'm always so thrown when they're not facing the way they do on a map and by the relative sizes. Country shapes are not my friend. Never noticed how much Mozambique looks like a squirrel before.
(Name according to Google Maps)