On the map of Africa, 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:
CD for Congo (Dem. Rep.)
CR for Congo (Rep. of)
GU for Guiana
GB for Guinea-Bissau
ZA for Zambia
ZI for Zimbabwe
You have 90 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.