Just because someone is going to bring it up soon - Singapore technically doesn't border Malaysia because technically there's a river dividing it and Malaysia so technically Singapore is actually an island and therefore technically Brunei would be the only acceptable answer.
It's essentially an image version of this quiz: https://www.jetpunk.com/quizzes/countries-by-borders-quiz
Basically, each picture shows a set of countries that are next to each other on a world map. only one of them borders all of them. you have to name that one. The clearest example is image 7 (left-middle). The countries are Spain, France, and Andorra. You know it's not spain because then Portugal would be shown, and it can't be France because then all the other stuff France borders would be shown. but Andorra only borders France and Spain, so the answer is andorra. It's complicated but fun and interesting when you get the hang of it.
Wow, unusual and hard, I love country shape quizzes but they are one of my greatest weakness on this site it seems. I missed a few of them and doubt I would have ever gotten a couple of them.
Otherwise AWESOME QUIZ
Basically, each picture shows a set of countries that are next to each other on a world map. only one of them borders all of them. you have to name that one. The clearest example is image 7 (left-middle). The countries are Spain, France, and Andorra. You know it's not spain because then Portugal would be shown, and it can't be France because then all the other stuff France borders would be shown. but Andorra only borders France and Spain, so the answer is andorra. It's complicated but fun and interesting when you get the hang of it.