Australian lottery Oz Lotto
Oz Lotto is a national lottery game, administered by Tattersall's and played on Tuesday nights. It was introduced on 26 February 1994 and promoted as the first fully national lotto game, at a time when New South Wales was not a part of Saturday Lotto.
Originally, the game was the same as Saturday Lotto, requiring six numbers to be picked out of 45. However, starting 18 October 2005, a seventh number began to be drawn, greatly lengthening the odds of winning Division 1 (close, but not longer, than that of Powerball). In line with this change, branding for Oz Lotto changed in many states, to emphasise the seventh ball (including new names, such as Super 7's Oz Lotto in Tatts regions, and Oz 7 Lotto in Queensland). Due to the introduction of a seventh number, Oz Lotto provides a very poor return for the high entry cost per ticket. The return per entry is less than 40.0% (or $0.40 return for the $1 entry cost) at Oz Lotto's starting jackpot of $2,000,000.
Oz Lotto currently holds the record for the largest Australian lotto jackpot prize. Originally guaranteed at $90 million, two winners (from Queensland and South Australia) shared a Division 1 pool of $106,549,984.76 in the draw on 30 June 2009.
Although the draw now requires seven numbers to be selected, the minimum prize level (of 3 winning numbers and one of the supplementary numbers) was unchanged, thus leading to seven prize divisions: