Flags game

Fun game to learn the flags of all the countries and improve your memory.
You are given 30 seconds to guess as many flags as possible.
You are given a country name and 2 flags to choose from, if you guess wrong, the right flag is shown for 3 seconds to memorize it.
The score for each correct answer increases as the number of correct answers goes up.
As the score goes up, you are given 3 then 4 flags to choose from.

This is the first version of the game; feedback is very welcome.
In the next versions there will hopefully be more features like multiplayer competition online.