Atlassino Academy · Slots · Lesson 7

Jackpots: once in a hundred million

The glass of a machine names its biggest prize. Chile’s slot standard says how rare that prize may be and what a growing progressive has to show. Here it is, counted out.

  • About 12 minutes
  • Illustrated hosts: Leo and Maya
  • Last checked 5 November 2026

The glass of a slot machine names its biggest prize. How rare is that prize allowed to be in Chile, and what does “once in 100 million games” mean for someone who plays?

The short answer

The technical standard for slot machines of the Superintendencia de Casinos de Juego sets a floor: the biggest individual prize published on each machine will come up, statistically, at least once in 100 million games. That is a chance per game, not a date. At about 600 games an hour, 100 million games is 166,667 hours, about 19 years without a break; and even after 100 million games, the chance that the prize has not come up once is about 36.8%. That is our count, at the floor. A progressive prize, which grows from a share of the bets, has rules of its own: it has to come from a random event decided by the machine in play, its rules are on the machine, and its sign may never show more than the pool really holds.

Leo smiling, explaining with an open hand.

Leoformer dealer · rules and maths

“Once in 100 million” sounds like a number you could reach. It is a rule about how rare the biggest prize may be, and it is easiest to read once you turn it into hours.

Once in 100 million games: the rule

The standard defines the biggest individual prize published on each slot machine, which will come up, statistically, at least once in 100 million games. We read that as a floor on rarity: the chance of the biggest prize on a single game may not be smaller than 1 in 100 million. A machine may make it likelier; it may not make it rarer.

The rule applies to every bet that takes the biggest prize, and when that prize can come up inside a bonus round or a run of free games, the count includes the chance of getting to the round. It leaves out two cases: several accumulated prizes taken in a single game, when the accumulated prize is not published, and games in which a run of free games can pay the biggest prize several times.

What the floor covers, and what it leaves outFrom point 3.2.35 of the technical standard for slot machines of the Superintendencia de Casinos de Juego.
The caseDoes the floor apply?
The biggest individual prize published on a machineYes
Every bet that takes that prizeYes
The biggest prize reached in a bonus round or a run of free gamesYes, counting the chance of getting to the round
Several accumulated prizes taken in one game, when the accumulated prize is not publishedNo
Games where a run of free games can pay the biggest prize several timesNo

The first three rows are where the floor of 1 in 100 million holds; the last two are the cases the same point leaves out.

There is a second “100 million” in the regulator’s own words, and it is about something else. The Superintendencia explains that a machine’s program has to return at least 85% of what is bet over a statistical series of about 100 million plays. That is the return to player, a share of the money bet over a machine’s working life; the floor on this page is the rarity of one prize. What the return means, and what it does not, is lesson 2.2.

A hundred million games, counted

The standard counts in games; a player lives in hours. The pace connects the two. Researchers who timed traditional reel machines put it at a game about every 6 seconds, around 600 games an hour. That is a measured pace, not a Chilean rule: a machine may be played slower or faster, and the table also shows a faster one, 1,200 games an hour, as our example.

100 million games, countedOur count, at exactly 1 in 100 million per game, the rarest the standard allows. The pace is an example, not a rule.
How you playTime to 100 million games
600 games an hour, with no break166,667 hours, about 19 years
1,200 games an hour, with no break83,333 hours, about 9.5 years
600 games an hour, 3 hours a weekabout 1,068 years

Every figure is our count at the floor of the standard. A machine that makes its biggest prize likelier than the floor brings it sooner on average; the standard does not say by how much, and neither does this page.

Counting the chance tells the same story from the other side. At the floor, one game has a 1 in 100 million chance. An evening of 3 hours at 600 games an hour is 1,800 games, and the chance that the biggest prize comes up at all in it is about 1 in 55,556. Even 100 million games do not make it certain.

  1. One game

    1 in 100 million, at the floor.

  2. One evening

    1,800 games: about 1 in 55,556 that it comes up at all.

  3. 100 million games

    About 63.2% that it has come up at least once, and about 36.8% that it has not.

“Once in 100 million” is an average over a very long series, not a promise for any one of them.

Nor does the machine keep count of what it has paid or not paid. Its certified system of random results makes each play independent of the one before and the one after, so the biggest prize is no less likely on the game right after it came up, and no more likely after a long time without it. How the draw picks a result, and why a machine may not stage a near miss, is lesson 2.12.

Maya with a hand on her chest, speaking gently and seriously.

Mayaformer floor supervisor · manners, money and breaks

The biggest prize on the glass is the part of the machine that is easiest to dream about and least likely to happen tonight. Plan the evening as if it will not come, because at the floor it almost never does: about 1 in 55,556 for a whole evening.

If playing for that prize keeps pulling you back, the box below says where self-exclusion and the regulator are reached.

If it stops being fun

If gambling stops being fun, the SCJ self-exclusion applies in every casino in the country. Minimum entry age: 18 (age of majority under Law 19.221; Law 19.995 bars minors from gaming rooms). The casino may ask for an official ID. More on responsible gaming.

Show all regions
+56 2 2589 3000All regions · Superintendencia de Casinos de Juego — Central Telefónica

When the prize grows: progressives

Some machines offer a prize that grows. In the standard’s words, a progressive prize grows by a percentage that comes from the contributions of the players’ bets, plus a base the operator sets in the game program. A progressive that can only be reached on one machine is an isolated one; every other is linked. A linked progressive joins two or more machines in the same casino, or, as a wide-area system, machines in more than one casino.

However many machines feed it, the progressive follows the same rules for everyone at them. Every player at a machine that offers a progressive has to be able to reach it under the rules of the game. Every progressive prize that comes up has to rest on a random event, and the machine decides who receives it, as the result of a game; nobody picks a player.

The rules are on the machine before the first bet. If a linked progressive needs a minimum bet to take part, that rule has to be easy to apply and told to players in the rules of the game or the artwork of the machine; and the rules of the progressive have to be clear, complete, easy to understand and open to everyone who wants to play for it.

The size of the bet is part of those rules. On a linked progressive with several coin values, the chance of the progressive has to be the same at each, with the prize scaled to the coin value; where a game offers the progressive on bets below the maximum, the chance should not depend on the amount bet, and a game that works otherwise has to warn of it clearly in its help screens. So whether a bigger bet changes anything is a question the help screens of that machine answer, not a guess.

What the sign has to show

The figure over a row is the part everyone sees. The display has to show the current total of the progressive pool, in money or in credits; it may never show less than the base of the pool, never more than its maximum where a maximum is set or announced, and never more than the real current amount of the pool. Because the increments reach the sign with a delay, the amount shown has to be updated accurately and as often as possible, within 30 seconds at most.

What the sign of a progressive has to doFrom point 3.14 of the same standard.
The sign has toThe sign may never
Show the current total of the pool, in money or in creditsShow more than the pool really holds
Keep up with the pool within 30 seconds at mostShow less than the base of the pool
Show the exact amount paid when the progressive comes upShow more than the maximum, where a maximum is set or announced

Left column: what the sign of a progressive has to do. Right column: what it may never show.

The counter of a linked progressive has to be visible from every machine on the link, on the machine’s own screen or on a raised display. When the progressive comes up, the notice has to include the amount, and the display has to show the exact prize paid.

Leo raising one finger, thinking something through.

Leoformer dealer · rules and maths

A big figure over a row tells you how much is in the pool, and that is all. It does not say the prize is close, and it does not change the chance of the next game.

Practice: counting, and the sign

Level 1 gives the floor of the standard and a way of playing, and asks what that comes to in hours, years or chances. Level 2 describes something on a progressive machine and asks whether it meets the standard.

Nothing is bet here, and nothing is random. Each question is a set situation; the counting starts from the floor of the standard, and the amounts are an example in betting units.

The practice table needs JavaScript. Here is one question from it, with the answer.

How long until the machine has played 100 million games?

  • About 19 years 100,000,000 games at 600 an hour is 166,667 hours, and a year without a break has 8,760 hours.
  • A few months: the machine is fast A day without a break at that pace is 14,400 games, and 100 million games takes 166,667 hours.
  • Less: the prize has to come up within those 100 million games, so it comes sooner The floor is an average over a very long series, not a deadline. Nothing makes the prize come by the 100 millionth game: it may come much earlier, or much later.

The standard sets a floor for the biggest prize: at least once in 100 million games, statistically. Counted at that floor, it is a chance of 1 in 100 million on each game, not a date: it says nothing about when, and the next game has the same chance as the last.

Does this meet the slot machine standard, or break it?

  • It meets the standard It breaks it. The sign of a progressive may never show an amount larger than the real current amount of the pool.
  • It breaks the standard The sign of a progressive may never show an amount larger than the real current amount of the pool.
  • It is fine, as long as the prize is paid in the end The standard is about how the prize is reached and shown, not only about whether it is paid.

A progressive prize is reached by every player under the rules of the game, comes from a random event decided by the machine in play, and has its rules, any minimum bet included, on the machine. Its sign shows the real pool: never more than it holds, never less than its base, kept up to date within 30 seconds.

Every question in the practice run is worked out the same way: the counting starts from the floor of the standard, 1 in 100 million per game, and the rules come from the standard quoted on this page.

How the practice run works

Where the questions come from. Level 1 is our count at exactly 1 in 100 million per game, the rarest the standard allows. The wrong answers are named mistakes: taking the floor for a deadline, taking the chance of one game for the chance of an evening, counting a weekly habit as nonstop play, getting the pace backwards, and taking a long wait for a debt. Level 2 puts what happens on a progressive machine through point 3.14 of the standard.

One strip, and no rounds. Every square on the strip is one question of this lesson, and all of the squares are there from the start. Your first answer fills the square it belongs to; when the squares of one level are full, the next level begins by itself. Practising a question you got wrong turns its cross into “fixed in practice” and does not change the count, because only first answers count.

Your progress stays in this browser, and nothing is sent anywhere.

Check yourself

Maya with a finger raised and a knowing look.

Mayaformer floor supervisor · manners, money and breaks

Three quick ones. Pick an answer, then check it. No timer, no points: just whether it stuck.

A question marked “New situation” asks you to use the lesson on a case it did not show.

1The glass of a machine names its biggest individual prize. What does Chile’s slot machine standard say about how often it comes up?

Show the answer

Answer: Statistically, at least once in 100 million games. The biggest individual prize published on each machine will come up, statistically, at least once in 100 million games.

  • Nothing: each casino decides how rare it is The standard sets a floor for every machine in the country.
  • Statistically, at least once in 100 million games That is the floor the standard sets for the biggest individual prize published on each machine.
  • At least once a year on every machine The standard counts in games, not in time: how long 100 million games takes depends on how often the machine is played.
2You play 3 hours every week, at about 600 games an hour. Counted at the floor of the standard, about how long until you have played 100 million games? new situation

Show the answer

Answer: About 1,068 years. The floor is counted in games; the hours come from the pace, here a measured pace of a reel machine.

  • About 1,068 years 156 hours a year at 600 games an hour, against 166,667 hours of play.
  • About 19 years That is the time with no break at all, day and night.
  • It does not matter: the prize is due before then The floor is an average, not a deadline; the prize is never due.
3The sign above a row of linked machines shows a growing pool. What may it never do?

Show the answer

Answer: Show more than the pool really holds. The sign shows the current total of the pool, never more than it really holds and never less than its base.

  • Show more than the pool really holds The sign may never show an amount larger than the real current amount of the pool.
  • Show the pool in credits instead of money The standard allows the current total in money or in credits.
  • Change more often than once a minute The opposite: the amount shown has to be updated within at most 30 seconds.

Back to the question we opened with. The biggest prize on the glass may be no rarer than once in 100 million games. At about 600 games an hour that is 166,667 hours of play, and still not a certainty: an average, not an appointment.

Where to go next, and further reading

18+ across Chile · Play responsibly · self-exclusion is further up this page

Further reading

  • Estándares para Máquinas de Azar · Superintendencia de Casinos de JuegoThe regulator’s technical standard for slot machines: the 85% minimum return, the random number generator and the ban on faking a near miss.
  • Funcionamiento de los juegos: Máquinas de azar · Superintendencia de Casinos de JuegoThe regulator’s plain-language page on slot machines: instructions in Spanish, minimum bets and independent results.
  • Preguntas frecuentes · Superintendencia de Casinos de JuegoThe regulator’s answer on slot odds: a minimum 85% return over about 100 million plays, and why it is not the chance of a prize.
  • PAR sheets, probabilities, and slot machine play · Kevin Harrigan and Mike Dixon, Journal of Gambling Issues (2009)What a manufacturer’s PAR sheet says about a machine: how often it pays, how much the payback swings, and the several versions of one game.

How it’s worked out

Rules, numbers, sources and hosts

Where the rules come from. The floor of the biggest prize is point 3.2.35 of the Estándares para Máquinas de Azar, the technical standard for slot machines of the Superintendencia de Casinos de Juego, in its July 2019 edition. The progressive rules are its point 3.14, on how progressives work, and the definitions of progressive prizes in its glossary. The second “100 million”, about the return, is from the regulator’s questions and answers; independent results, from its plain-language page on slot machines. Nothing here says more than these texts print.

The counting. Every hour, year and chance on this page is our own count, not a figure from the regulator. It takes the floor as exactly 1 in 100 million per game, the rarest the standard allows, and every game as independent. The pace of about 600 games an hour is what two researchers measured on traditional reel machines; 1,200 games an hour is our example of a faster machine. A year without a break is 8,760 hours; a weekly habit is counted over 52 weeks.

What this page does not say. It gives no chance for any real machine or casino: the standard sets a floor, and a machine may make its biggest prize likelier. Point 3.2.35 speaks of the biggest individual prize published on a machine; whether a progressive pool counts as that prize, it does not say in those words, so this page does not apply the floor to progressives. The rules for progressives linked across casinos are in a separate circular of the Superintendencia that we have not read, and nothing here is taken from it. There are no amounts in pesos: the amounts in the practice run are betting units, as an example. What a machine pays back is lesson 2.2, how often it pays is lesson 2.3, and how the draw picks a result and why a machine may not stage a near miss is lesson 2.12.

Our readings. We read “por lo menos una vez en 100 millones de juegos” as a floor on rarity, not a schedule, and “evento orientado al juego” as a result decided by a game played on the machine. The words in the questions, such as “catches up” or “draw players”, are ours.

Sources. Every claim on this page carries a button with the sentence it rests on, in the document’s own language, the publisher who wrote that sentence and the date we read it.

Hosts. Leo and Maya are illustrated characters. Their backstories, a former dealer and a former floor supervisor, are written for the course: neither is a real person, and neither speaks for any casino. The rules and numbers on this page come from the sources it cites, not from their experience.

No promise. Knowing how rare the biggest prize is does not change which numbers come up. It lets you read the glass and the sign for what they say, and plan the evening without them.

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