Oz Lotto draws every Tuesday night under The Lott umbrella. The bare format — 7 mains from 47 — already produces Division 1 odds of about 1 in 62,891,499 per single entry. That's harder than Saturday Lotto's 1 in 8.1M, easier than Powerball Australia's 1 in 134.5M.
Three supplementary numbers (rather than the 2 you get on Saturday Lotto) is the part that quietly reshapes Divisions 2–5. With three supps in play, more partial-match outcomes become possible. Division 2 needs 6 mains plus any one supplementary, Division 3 is 6 mains exact, Division 4 is 5 mains plus a supplementary, Division 5 is 5 mains exact, and Division 6 starts at 4 mains plus a supplementary.
Min jackpot is A$2M most weeks. Megadraws push that up to A$30M, A$50M, and on rare occasions higher. As with all of The Lott games, the prize tier sizes depend on actual entry volume — a quiet week can mean Division 3 hands out A$1,800 instead of the more typical A$1,200.
Where Oz Lotto really differs from Saturday Lotto in feel is the Tuesday slot. The audience is smaller per draw, prize pools are correspondingly tighter on a base week, and Megadraws stand out more than Saturday Lotto's regular weeks. That makes for chunkier rollovers when Division 1 doesn't land.