Wikipedia
EuroMillions is a transnational lottery, launched on 7 February 2004 by France's Française des Jeux, Spain's Loterías y Apuestas del Estado and the United Kingdom's Camelot. The first draw was held on Friday 13 February 2004 in Paris. Initially, only the UK, France and Spain participated, with the Austrian, Belgian, Irish, Luxembourgish, Portuguese and Swiss lotteries joining for the 8 October 2004 drawing.
Draws are held every Tuesday and Friday night at 20:45 CET in Paris. A standard EuroMillions ticket costs €2.00, £2.00 or CHF3.00 per line played, depending on the local currency. (An option, called Plus, currently available only in Ireland and Portugal, adds €1.00 per line; and a new (as of February 2014) non-optional addition called "My Million" in France adds €0.50 per line) The cost of playing in the UK increased from £1.50 to £2.00 per line on 7 November 2009, due to the combination of: the EUR/ GBP exchange rate, and an automatic entry in its Millionaire Raffle.
From September 24th 2016. The amount of lucky stars will again change from a pool of 11 to a pool of 12 numbers. Decreasing the jackpot winning odds from 1:117million to 1:140million. More rollovers are expected to happen plus a starting jackpot of £14million.
All prizes, including the jackpot, are tax-free (except in Switzerland, Spain and Portugal since 2013) and are paid as a lump sum.