Oz Lotto was created as Australia's original national lottery game. It was played on Tuesday nights and administered by Tattersalls.

It was created on February 26, 1994, at a time when New South Wales did not take part in Saturday Lotto, making it the only national lottery game at the time - a distinction which lasted until the launch of Powerball in 1996, and New South Wales' subsequent joining of Saturday Lotto in 2000.

To begin with, Oz Lotto was exactly the same as "Tattslotto", where players selected six numbers from 45. Oz Lotto was more expensive (at $1 per game plus agent's commission), however it paid better dividends than Saturday Lotto.

However, starting from Draw 609 on 2005-10-18, the game was restructured so players selected seven numbers from 45. This makes it more difficult to win Oz Lotto's first division, however there are now more prize divisions:

First Division (Jackpot) - All seven winning numbers in a game

Second Division (Average) - Any Six winning numbers plus one or both supplementary numbers

Third Division (Average) - Any Six winning numbers

Fourth Division (Average) - Any Five winning numbers plus one or both supplementary numbers

Fifth Division (Average) - Any Five winning numbers

Sixth Division (Average) - Any Four winning numbers

Seventh Division (Average) - Any Three winning numbers plus one or both supplementary numbers

After the October 2005 changes, Oz Lotto has become known under slightly different names in some areas. In the Tattersalls jurisdictions (Victoria, Tasmania, Australian Capital Territory, Northern Territory), it is now known as Super 7's Oz Lotto; in Queensland it is now called Oz 7 Lotto. In South Australia and Western Australia the name did not change, but new logos were introduced; Lotterywest including a "7" as part of the letter "z" of their new Oz Lotto logo. No major branding changes were made to Oz Lotto in New South Wales.