including the Black Sea? Oops. I didn't see that. I know that the Black Sea is colored in, but it's not really obvious and a lot of people would not include it in the Atlantic Ocean. Those were the only ones I missed. I think It'll be better if you make it clearer.
Nice quiz, though the International Hydrographic Organisation definition of the Atlantic Ocean has it ending at the Strait of Gibraltar. I suggest, if you want to include Mediterranean countries in this quiz, that you be specific about that in the instructions. I don't agree that the Mediterranean Sea is "generally considered" to be a part of the Atlantic Ocean - ask anyone living in Istanbul or Naples or Barcelona what body of water they are next to, and none of them will say "Atlantic Ocean".
Needs more time but otherwise a good quiz! I've been to the point in Morocco where the Atlantic Ocean begins and the Mediterranean ends. It's a gorgeous view and I recommend for others to visit it.
I'll consider it, I think this map deserves a larger update (as with many of my other older maps, my map making skills back then don't hold up well to my current expectations).