The issue here is that you can just name all the counties in the world and beat the quiz easy without having to think about obesity rates.
To tackle this you could - reduce the amount of countries as answers to just the top 20 for obesity %. Or you could have it so you have to name them all in order.
If the list includes every country in the world, without a yellow-box answering style, then quiz takers can just name every country in the world and easily beat the quiz...
I think it would be better to narrow the list down to, maybe, the top 20 most obese and top 20 least obese countries.
The issue here is that you can just name all the counties in the world and beat the quiz easy without having to think about obesity rates.
To tackle this you could - reduce the amount of countries as answers to just the top 20 for obesity %. Or you could have it so you have to name them all in order.
I think it would be better to narrow the list down to, maybe, the top 20 most obese and top 20 least obese countries.