If only π were 3, mapmakers would have an easy time portraying Earth on a flat surface. Instead, every mapping from a sphere to a plane requires some projection
that preserves some aspects of the sphere while distorting others.
There are many projections for mapmakers to choose from, but the most common is the Mercator projection, also known as "Boy Do We Love Greenland". Googler +Luke Mahe
created a snappy Mercator puzzle at https://gmaps-samples.googlecode.com/svn/trunk/poly/puzzledrag.html
which Research at Google spent an enjoyable ten minutes solving. All you have to do is move the countries around until they match, but since the Mercator projection distorts size based on latitude, it's not as easy as it seems...