Campaigners for a British EU exit, or Brexit, on Friday offered a prize of 50 million pounds (73 million dollars) to any registered voter who correctly predicts the score of every match in the next month's Euro 2016 football tournament.
"Predict the European football championships 2016 results and win 50 million pounds, the UK's official bill for EU membership every single day," urges a new Vote Leave website, 50million.uk.
Dominic Cummings, Vote Leave's campaign director, said the competition is "an attempt to engage with large numbers of people who normally ignore politics" ahead of an in-out referendum on Britain's membership of the European Union on June 23.
"Too many people, particularly younger voters, don't engage in politics and do not plan to vote in the referendum," Cummings said.
The 24 Euro 2016 finalists will stage 51 matches in the tournament in France, making it extremely unlikely that anyone will correctly predict the result of each match. But Vote Leave said it has taken out insurance to cover the possibility of someone claiming the prize.
If, as expected, no one wins the main prize, Vote Leave will give 50,000 pounds to the "last person standing" with the longest sequence of correct results from the start of the tournament.
The website asks participants how they might spend 50 million pounds, suggesting four possible choices: Half of the cost of Real Madrid and Wales footballer Gareth Bale; the entire 2014-15 Leicester City squad; two Stadiums of Light, the home ground of Sunderland football club; or 48 Bugatti Veyron luxury cars.
It warns that Britain's weekly contribution to the EU will rise to some 400 million pounds by 2020 if the country votes to remain an EU member.
The Remain campaign, which is led by Prime Minister David Cameron, claims Vote Leave's estimates for Britain's contributions to the EU are around double the real level.