While it’s mentioned alongside several National Lottery games, players may still be unsure what it actually does and whether it’s worth paying extra for. MP1 stands for Multiplay, a feature that allows players to select one additional number beyond the standard number selection for certain National Lottery games. ADVERTISEMENTOn Lotto, Lotto Plus 1 and Lotto 5 Max, players normally choose six numbers. Why does MP1 cost seven times more? MP1 does not make any individual combination more likely to win.