Vicky's quiz All First-Level Subdivisions of Asia on a Map is already challenging enough if you remove the lesser populated subdivisions! How many of the first-level subdivions of Asia with more than a million inhabitants can you name?
Open the svg file in Inkscape. Optionally merge the low pop subdivisions per country, then delete leftover lines (which is tedious). Then use the fill option to make these subdivisions gray. Sometimes they don't appear gray after uploading to jetpunk. In this case, add "grey" as a class.