On the map of Oceania, you will see a country highlighted in blue.
Type the first letter of the highlighted country except for the following countries, which require two letters:
TO for Tonga
TU for Tuvalu
You have 20 seconds.
Inspired by this: U.S. States - Type the First Letter. I found this quiz to be a brilliant way to quickly memorize the locations of states, so I thought use this method for countries as well.