Judging from your instructions, you intended the name of the island to be visible and for us to give it's parent country(ies). The name of the island isn't visible. Judging by the results (av 15/20), that's just fine.
If I gave the name of the island, the quiz would be too easy. I wanted to add an extra level of thinking: first come up with the island name, then think of the country the island is in. I understand the instructions are a bit weird but I was hoping the user would be able to figure out what to do fairly quickly.