--- Visit the following link to play: https://worldcup-flag.firebaseapp.com/
Additional ideas to extend this application/idea:
- Create a memory matching game, where all of the flags are hidden and you have to find 2 matching flags by flipping over only 2 at a time.
- Timing a user to see how quickly they can successfully identify all flags.
- Use the same codebase to create dynamic self-test by allowing users to supply their own JSON dataset