Countries
100

Countries in South East Asia (atleast 1).

What is Myanmar, Thailand, Laos, Cambodia, Vietnam, Philippines, Indonesia, Malaysia, Singapore, Brunei, Timor-Leste/East Timor? (any of the mentioned)

200

Countries in Africa.

I know dw.
300

Countries once part of Yugoslavia. 

Bonus

Serbia, Bosnia and Herzegovina, Croatia, Slovenia, Montenegro, North Macedonia,