Do you know your flags of the world? Think you're a pro at guessing which flag belongs to which country? Have a go at this Top Class 'Flags of the World' quiz to see if you can get a high score.

Almost every flag in the extensive collection of world flags is recognizable as rectangular. But among all the nations, there are two exceptions—nations with perfect squares for their official flags.

The American flag is one the most well-known symbols around the world, but how many of the other 194 country flags can you ...