Test Your Knowledge - overview http://banknotes.rba.gov.au/games.html Banknote Challenge http://banknotes.rba.gov.au/banknotechallenge.html# Eye Spy Security Measures http://banknotes.rba.gov.au/eyespy.html# Banknote Puzzle http://banknotes.rba.gov.au/banknotepuzzle.html#