Mega Sena

How the Game Works

Players select 6 numbers from a pool of 1 to 60. Each ticket covers one combination. The official draw selects 6 main numbers plus 2 supplementary numbers (mega-acumulada mechanism). All draws occur on Wednesday and Saturday nights.

The 2 supplementary numbers function separately from the main 6. They determine whether your ticket qualifies for secondary prize tiers. This two-stage draw structure is common in Brazilian lotteries and creates multiple winning paths per draw event.

Minimum bet is one standard 6-number line. Players can add more lines on a single ticket, and some retailers allow system plays where you select more than 6 numbers per line (8, 9, 10, or more). A system play generates multiple combinations from your larger selection, increasing both cost and number of chances.

Prize Tiers and Odds

Mega Sena has six prize categories. All match at least 4 main numbers to win; the highest tier requires all 6 main numbers.

Prize Structure: Match 6 of 6 main numbers: first prize. Match 5 of 6 main numbers plus 1 or both supplementary: second and third prizes. Match 5 of 6 main numbers alone: fourth prize. Match 4 of 6 main numbers: fifth prize. Match 4 main numbers plus both supplementaries: sixth prize.

The total odds of winning any prize tier combined sit near 1 in 2,332 per line played. The odds of matching all 6 main numbers are approximately 1 in 50,063,860. This wide range reflects why most players win smaller tiers while jackpots accumulate across multiple draws.

Prizes split among all winners in each tier who match the same combination. If 100 people select the same 6 numbers, they share the first-prize pool equally. The state withholds tax on all prizes above certain thresholds, typically around 13.8 percent, though exact rates depend on prize level and current federal rules.

Draw Schedule and Timing

Mega Sena draws take place on Wednesday and Saturday evenings, usually around 8 PM Brasília time. Results post within minutes of the official draw conclusion. Ticket sales close 2 hours before each draw in most cases, though times vary by retailer.

Draws never skip. The game has operated continuously since its launch in March 1996, accumulating prize pools when no jackpot winner matches all 6 numbers in a given draw. This accumulation rule drives the marketing around jackpot spikes but does not change underlying odds or mechanics.

Mathematical Framework and Expected Value

Expected value (EV) in Mega Sena is negative for players, as with all lotteries. The state returns approximately 50 percent of revenue to prize pools, meaning each dollar spent expects a return near 50 cents across all tiers and over large sample sizes.

Your individual ticket has no memory. Buying two tickets doubles your chances of any single draw, but does not improve odds in subsequent draws. Numbers that have not appeared recently are as likely to draw as those that appeared recently, a principle known as independence of events.

Syndicates (pooled tickets) do not improve mathematical odds per person, but they allow groups to afford more lines. A 10-person syndicate each playing 10 lines has the same combined odds as 100 individual players with 1 line each, but distributes cost and potential winnings across the group. Syndicate structures should have written agreements to avoid disputes over prize division and contribution rates.

System plays generate better coverage of number combinations but cost more. A system-7 (7 numbers generating 7 different 6-number combinations) costs 7 times a single line. It covers 7 different 6-number selections from your 7 picks, increasing your chance of matching within that set. The mathematical benefit depends on whether your selected 7 numbers contain the drawn 6, which is not guaranteed.

History and Regulation

Caixa Econômica Federal, a federal public bank, has operated Mega Sena since its debut on March 29, 1996. The game quickly became Brazil's most popular lottery format. Federal legislation and Caixa's own regulations govern all rules, prize payouts, and draw integrity.

Draws are conducted under official supervision with mechanical or electronic draw machines, depending on equipment in use during the specific draw date. Results are published on the official Caixa website and in major news outlets the same evening.

Prize claims have deadlines. Winners must present valid tickets to Caixa branches or authorized retailers within a specified window, usually around 90 days from the draw date. Unclaimed prizes revert to state funds after the deadline expires. Winnings above 1,903.98 Brazilian reais incur mandatory federal withholding tax at the time of claim.