Now in its second year, the RBS 6 Nations Live Challenge app responds to the live match action, allowing fans to have their say in-play on what will happen ahead of key moments in each game and enabling players to predict the result of penalties and guess where the kick will end up in conversions.
Trivia questions relevant to the match in-play also test rugby fans during the game. And with the new 2013 version allowing participants to win the match ball, the stakes have never been higher.
So far twelve lucky fans have won the match balls from the first four rounds, with winners based across the UK as well as in the USA and Holland. So what are you waiting for? Log on now and play the RBS 6 Nations Live Challenge to be in with the chance of taking away a piece of sporting history.
The RBS 6 Nations Live Challenge app is available to download for free for iPhone, iPad and Android - fans can log in via Facebook Connect. Visit http://rbs6nationslivechallenge.com to download it ahead of the RBS 6 Nations final weekend.