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Ninety-nine cents back on every dollar, in theory — that promise is what pulls Canadian players toward Book of 99, Relax Gaming's Greek-myth book slot. Behind the 99% theoretical RTP sit 5×3 reels, 10 fixed paylines, a 99-book collection meter, high volatility and a provider-stated 5,000× cap. Below: our C$ Session Value Calculator, the five Ontario-licensed casinos we compare side-by-side, and the bonus-wagering trap to dodge.
Six dimensions, graded one at a time — RTP and maths, volatility honesty, bonus design, feature depth, audio-visual craft and mobile. Three of them carry Book of 99; three of them are the reason it stops at 8.0 instead of climbing higher. Every mark below carries the editor's name.
Odysseus heads the premium row, with Cyclops, Calypso and Kirki behind him on a familiar book-slot engine. Heavy vector outlines and warm Mediterranean colour keep every symbol readable at phone size, which matters more here than the art itself does.
The presentation earns its mark in one place: the expanding-symbol reveal. One mythical character is drawn at random before the free spins start, then fills its reel and pays from any position for the whole round. Small flourish, big job — it turns the bonus into the part of the game you actually watch.
There is no cinematic opener and no particle spectacle: the theme is executed rather than invented. That is the whole reason visual & audio lands at 7.8/10 and not a point higher.
Base-game audio stays deliberately low — a soft lyre-flavoured loop with light percussion under it. Built for long, patient sessions instead of noise, and it holds up on the twentieth repeat as well as the first.
It comes alive as the 99-book collection meter climbs. Each banked book nudges the mix, and when the round finally opens and the drawn symbol expands, the score rises to mark the ten spins that can actually pay.
It is a 2021 mix, so the SFX are clean and balanced, but the audio is support — the meter and the expanding symbol are the headline. On a high-variance value game, that is the right call.
Cartoon Homer's Odyssey across five reels — Odysseus, Cyclops, Calypso, Kirki. Under the packaging sits a high-RTP, high-volatility engine aimed at giving back 99% across the long run. The return is the selling point; a headline win is not.
The 99-book collection meter is what changes the mood. Books and wilds bank toward 99 in plain sight, and visible progress is hard to walk away from — the closer the count creeps, the more a session extends itself. It hands a plain book slot a running goal.
In Canada that argument meets a practical question — what is your lobby actually serving you? Ontario's regulated sites operate on AGCO and iGaming Ontario licences and Relax Gaming supplies that market, but no regulator publishes a per-title return list, so the only proof of the configuration in front of you is the in-game (i) panel. Open it, read the number, then decide. The demo and the C$0.10 minimum make that check cost almost nothing.
Fifty spins is enough to read the profile: rated High volatility, with one published hit-frequency figure of 29.83% from a single indicative source. Dead runs are normal and the balance can slide a long way before anything lands. The calm return does not describe a calm session.
Free spins split the game in two, and there are two ways in: 3+ book scatters on one spin, or a full 99-book collection meter built up in the base game. A symbol is drawn at random as the round opens and expands across its reel — the top wins live there. It is a real idea, and past the retrigger it is the only one.
The 99% return pays you back in session length — roughly a 1% edge on turnover, about as good as slots get. The ceiling is the trade: a provider-stated 5,000× cap (aggregator simulations run to 12,075×, a simulated figure rather than Relax Gaming's stated cap) and no jackpot. A value game, not a max-win chase.
An 8.0 means recommended with a profile attached. One thing here beats almost everything in the class — the return — and the price of it is high variance and a single feature. The line items below explain the rest.
What pulled it up: the maths. 99.00% theoretical RTP leaves roughly a 1% house edge on turnover against the ~4% of a typical 96% game. The High volatility label is accurate rather than flattering, and honest labelling earns marks here too.
What kept it under 9: bonus design (7.0) and feature depth (7.2). One free-spins round, one randomly drawn expanding symbol, a retrigger — and nothing else. No bonus buy, no jackpot, and a provider-stated 5,000× cap that is modest for a game this volatile.
The decision. FOR — patient players who read the return in the (i) panel, run the demo first, and bring a reserve that can absorb a cold hour. NOT FOR — a spare C$20 on a Friday night, max-win chasers, and bonus hunters: a 99% return is exactly what many casinos exclude or weight down in wagering, so match funds can be wasted on it. If the maths fits the way you play, see the best real-money online casinos in Canada.
Judge this one on the return and the meter, not on a ceiling it was never built to reach. The 99.00% RTP and the 99-book counter keep the long-run maths on your side; High variance and the 5,000× cap are what you pay for that. Confirm the return in the (i) panel first, then play it for what it is.
Most Ontario-licensed casinos offer a free Book of 99 demo (play-money credits, no sign-up, no deposit) so Canadian visitors can test this Greek-myth, Odyssey-themed slot instantly. The famous 99% RTP slot — try it free before you stake a single Canadian dollar. Below the stage: AGCO-registered operators that carry the game, with plain, non-promotional facts — always verify current terms at the operator.
Click to load the Book of 99 demo
Play-money credits · no download, no sign-up · 19+ (18+ in Alberta, Manitoba and Québec) · play responsiblyOne session cannot produce a return figure worth printing, so this page prints none. What follows is Relax Gaming's published spec — the theoretical return and the single indicative hit-frequency figure — with our play notes kept separate and labelled as notes. The only return quoted anywhere here is the provider's 99.00%, and the only place to confirm it for your own lobby is the in-game (i) panel.
Set a bankroll, a bet and how long you want the session to run. The tool treats the published 99.00% RTP as a flat 1% cost on turnover — what putting money through the game is expected to cost across the long run, not what tonight will do. That cost lands on turnover, every C$ you wager, and never on your deposit.
| Bankroll | Bet / spin | Raw spins | Expected house take |
|---|---|---|---|
| C$50 | C$0.10 | 500 | ~C$0.50 |
| C$100 | C$0.20 | 500 | ~C$1.00 |
| C$100 | C$1.00 | 100 | ~C$1.00 |
| C$250 | C$0.50 | 500 | ~C$2.50 |
The 99% return and the High label tell you what the game costs, not what it is like to sit through. Six tabs below take the parts that decide a session: the Book doing two jobs at once, the 99-book collection meter, both routes into free spins, the expanding symbol that produces the top wins, the rulings nobody spells out — and what the game simply does not contain.
Everything in the base game runs through the Book. It is a Wild, standing in for any paying symbol to finish a line, and it is a Scatter that pays on its own and can open the bonus. Each Book you land is also counted onto the 99-book collection meter, which is the idea the game is named after: reach 99 and the free-spins round starts by itself, with no scatter spin required. There is no bonus buy — the feature has to turn up while you play.
The same free-spins round has two entrances. The first is the ordinary one: 3 or more Book scatters on a single spin awards 10 free spins. The second is what separates this game from every other book slot — complete the 99-book collection meter in the base game and those same 10 spins start, on a spin that showed no scatters at all. Either way, before the round begins the game draws one mythical character at random to act as the expanding symbol.
One feature carries this game, and this is it. As the free spins open, the game picks one mythical character at random — Odysseus, the Cyclops, Calypso or Kirki. For the rest of the round that character works the way the book does in Novomatic's old template: land it anywhere and it stretches across the whole reel, paying from any position rather than left-to-right along a line. That is where every big result comes from, which is also why the draw itself decides whether a round is quiet or the best one you will see.
Three things get glossed over elsewhere, so plainly. The round does retrigger — 3 or more Books during free spins award 10 more. A round opened by the meter rather than by scatters still draws a random expanding symbol; Relax Gaming describes one bonus round, so the draw happens however you got in. And when the 99th Book lands mid-spin, that spin finishes paying first and the free spins begin after it. Where the exact sequence matters to you, the in-game (i) panel states the rules for the build your operator is running.
Reading a game properly means reading the gaps. There is no progressive and no fixed jackpot here — the headline number is a theoretical ceiling, not a pool that ticks upward while you watch. Relax Gaming publishes no bonus buy either, so there is no paying your way into the free spins; the round has to arrive on its own, in an Ontario lobby exactly as anywhere else. Past that single round there is no second bonus mode. None of it is a complaint — it is the reason the value sits in the 99% return rather than in extras.
The art is a light-hearted cartoon pass at Homer's Odyssey: a storybook palette around the reels, Odysseus at the top of the character symbols and the Cyclops (Polyphemus), Calypso and Kirki behind him. Being a 2021 build, the animation is tidy rather than cinematic — the one moment worth watching is the drawn symbol stretching across its reel in free spins. Underneath runs a soft mythic theme that rises as Books collect and the count approaches a trigger.
Eleven symbols, 10 fixed paylines on a 5×3 grid, left to right only. The four Greek characters start paying from 2 on a line; the five card royals need 3. Relax Gaming publishes no fixed public multiplier chart, so what follows is the tier order plus the job each symbol does — the exact × lives in the in-game paytable, which is also where you confirm the return your operator is running. One symbol carries the whole game: the Book, which is Wild and Scatter at once.
No per-symbol multiplier chart appears above because Relax Gaming does not release one as a fixed public figure. Anyone quoting exact × values for this game is reading them off a client, and clients differ — so open the (i) screen yourself before you stake, and while it is open, check that the return reads 99.00%. What the tiers do tell you is the shape: the five card royals (10 through A) sit at the bottom, the four Greek characters pay more, and Odysseus tops the lot. The money, though, is in free spins, where the drawn character fills its reel and pays from any position rather than along a line. As for the ceiling — Relax Gaming states a cap of 5,000× the bet, which is around C$5,000 from a C$1 spin. Aggregators have published a simulated figure of up to 12,075× (about C$12,075 at C$1); that is a simulation, not the provider’s stated cap. Nothing is pooled behind it: no progressive, no fixed jackpot, just a theoretical maximum.
The catch with a 99% RTP slot: many casinos exclude high-RTP games from bonus wagering, or count them at a reduced weighting, so playing Book of 99 with deposit-match funds can slow — or even void — a bonus. Wagering (or playthrough) is simply the number of times you must bet a bonus before you can withdraw it, and Book of 99 rarely helps you clear it. Check the bonus T&Cs before you opt in. There is no bonus buy and no jackpot here — the value is the 99% RTP, not a bought feature. The examples below are generic AGCO-registered / Ontario-licensed offers; deposits and payouts run in C$ via Interac e-Transfer (the default), Visa/Mastercard debit or a regulated e-wallet.
No reviews are hosted here. What follows is a pattern read across major slot-review platforms and community forums, cross-checked against an independent expert-review site (~4.5/5, July 2026). Two patterns dominate and they pull in opposite directions: the 99% return is what players notice, and the variance is what they complain about — quiet base spins, and a 5,000× ceiling nobody expects to see. The 99-book meter divides them on its own. None of this feedback is Canada-specific, so read it as a read on the game rather than on any Ontario lobby. Every item is anonymised and paraphrased: source type, period and rating only — never a name, handle or initials.
Pattern · what gets noticed first. Across platform reviews the return is the opening line almost every time, and it is framed as session length rather than winnings: the same stake lasts visibly longer here than on a 96% game.
Pattern · why players stay through a cold run. Forum threads treat the 99-book meter as the goal the base game would otherwise lack — visible progress while nothing is paying, which is exactly what keeps a session going.
Pattern · the single most repeated complaint. Flat, low-paying base spins come up in review after review, and reviewers tie them to the High volatility rather than to any fault in the engine. The figure that stretches a bankroll also thins out what lands.
Pattern · the split is always on the same line. The maths gets respect and the entertainment does not. Mixed verdicts keep coming back to two things: long gaps between features, and a bonus that only ever does one thing.
Pattern · where the harshest feedback lands. The last stretch of the meter draws the anger — the final books can take a long, silent run, and a minority read that as designed. The 5,000× ceiling is described as out of reach in the same breath.
Pattern · expert coverage agrees with itself. Independent expert scoring sits around 4.5/5 and repeats two points: the cartoon Odyssey presentation with Odysseus heading the premiums, and value at the top of the category.
Facts change — RTP configurations can be adjusted at operator level, provincial rules evolve, and provider spec sheets are revised. We date-stamp every change to this Book of 99 review below, and each entry is initialled by the responsible editor.
July 2026: initial Canadian review published — full Book of 99 analysis with the C$ Session Value Calculator
Pre-publication fact-check and responsible-gambling review
This page version is v1.0, published 01 July 2026. Older versions, once they exist, will be archived in our internal CMS and can be requested for citation purposes by emailing [email protected]. Major updates trigger a fresh review; minor updates are factual corrections only.
A review is worth what the people behind it are worth. Named below: the reviewer who played it, the compliance and responsible-gambling auditor who checked it, and the editor who signed it off — plus the affiliate disclosure that says how this page is paid for.
Claire's beat is the gap between a published return and what a bankroll actually experiences. For this one that meant working from Relax Gaming's spec sheet and the in-game paytable instead of a single short session — and saying plainly that no regulator publishes per-title configurations, which leaves the (i) panel as the only proof a player in Canada can check for themselves. Tech and QA review, and the responsible-gambling check, by Andrew Murray (Compliance & RG Auditor); edited and signed off by David Clarke, Editor-in-Chief.
Disclosure. SlotsGamblers is paid a commission when a reader registers through a tracked outbound link, and we may earn a commission from the operator links on this page. That money never reaches the score. The return figure, the volatility read, the feature analysis and the sentiment patterns would read word for word the same with no commercial relationship behind them. Operators we send Canadian readers to hold AGCO licences and are registered with iGaming Ontario, and a game that lands below our recommendation line is flagged as such no matter what it pays.
Book of 99 is Relax Gaming's headline high-RTP title, so its natural peers are other 99%-class classics and book-style slots — plus one deliberately higher-variance guide for contrast. These are internal reviews and guides for Canadian players, not a rival top-10: just fair alternatives that suit the same value-first profile.
In Ontario, real-money Book of 99 is legal only at casinos licensed by the AGCO and registered with iGaming Ontario — the province runs Canada's open, regulated online-casino market. Everywhere else you play through a provincial platform: PlayNow (British Columbia and Manitoba), OLG.ca (Ontario), Play Alberta, Espacejeux (Québec) or Atlantic Lottery. Whether any given site actually carries Book of 99 depends on its live Ontario lobby, so check the game list before you sign up. The table below lists Ontario-licensed operators only; every operator link is a tracked affiliate link and we may earn a commission from operator links. Age 19+ (18+ in Alberta, Manitoba and Québec).
Before you deposit, a safe Canadian casino should tick five boxes: an AGCO / iGaming Ontario licence (or a provincial lottery platform); registration with your province's self-exclusion scheme; play and payouts in C$; transparent wagering terms with no hidden bonus conditions; and Interac support. Canadians aren't typically prosecuted for playing at offshore sites, but you give up regulator recourse, provincial self-exclusion protection and any payout guarantee — the practical reason to stay on licensed sites. If cash-out speed matters most to you, see our roundup of the fastest-paying Canadian casinos.
Reader questions, answered by Claire Wilson inside 48 hours. Nothing is removed except spam — including questions that go after our methodology or our operator picks.
Every site quotes 99% for this game. Is that figure real, or is it marketing — and can it differ from one casino to the next?
It is real, and it is Relax Gaming's single published configuration: 99.00%, one of the highest theoretical returns in the category — roughly 1% of turnover to the house, against the 4–5% a typical 96% game keeps. Two things to hold onto. First, that number is theoretical and long-run; this game is high volatility, so a short session can finish nowhere near it in either direction. Second, an operator can in principle license a reduced build, and no regulator publishes per-title configurations — so the only proof available to you is the game itself. Open the (i) or paytable screen before you deposit and read the return. If it says anything other than 99.00%, that lobby is running a cut-down version and it is worth taking your session elsewhere.
I've banked plenty of books but the meter seems to crawl near the top. Why does it stall so close to 99 — is something rigged?
Nothing is stalling; the odds simply never changed. Books and wilds collected in the base game are counted onto the 99-book meter, and completing it awards 10 free spins with no scatters needed on that spin. The catch is that book number 98 is exactly as likely as book number 3 — so late in the count you can grind through a long, silent run with no tease pays to soften it. That is the high-volatility maths doing its job, not the game slowing down on you. Some players call the meter deceptive for that reason. It isn't: Relax Gaming is a registered iGaming Ontario supplier and the RNG is independently tested. Treat the count as a slow second route into the bonus, and set a stake that survives a cold run rather than one that ends with it.
Two questions: will I even find Book of 99 in my Ontario casino, and once the free spins start, can they retrigger?
On finding it — no regulator publishes per-title game lists, so whether it appears in your lobby comes down to that operator's live catalogue on the day. Check the game list before you sign up. What is verifiable: LeoVegas' Canada-facing site lists it, and Relax Gaming is registered as a supplier with the AGCO and iGaming Ontario, so the title is cleared for the regulated Ontario market. Outside Ontario the picture changes province by province and I can't promise a catalogue I haven't seen. On retriggers — yes. Land 3 or more books during the round and another 10 spins follow, with no published limit on how often that can chain. The expanding symbol drawn at the start stays the same for the whole feature, so a retrigger keeps that character filling its reel.
Canada splits in two for a game like this. Since 2022, Ontario has run a regulated private market — operators are licensed by the AGCO and contracted through iGaming Ontario — and Relax Gaming supplies that market as an AGCO-registered supplier, which is why this review can put five Ontario-licensed casinos side-by-side further down the page. Inside that framework, Book of 99's headline 99% theoretical RTP comes with a licensed operator and a real dispute route attached.
Outside Ontario, the regulated way to play is your provincial lottery corporation's platform, and the picture genuinely differs province by province — a title carried in one catalogue can be missing from the next. Wherever you load it, the machine is the same high-volatility book mechanic: 10 fixed paylines, the 99-book collection meter as a second door into free spins, and a provider-stated 5,000× ceiling. That is exactly the decision the C$ Session Value Calculator above was built for — it shows what a 99% theoretical return leaves of a session budget before variance starts swinging it around.
One habit worth keeping wherever you play: fix your session budget in C$ before you spin, not during. And if gambling stops being entertainment, ConnexOntario offers free, confidential support for Ontario players on 1-866-531-2600.
Play within your limits
Online slots are designed to lose more than they pay over time — even Book of 99's category-leading 99.00% theoretical RTP still leaves a structural 1% house edge over the long run. Gambling must stay entertainment, never a way to make money or recover losses. If it stops being fun, free, confidential help is available 24/7 right across Canada.
Warning signs to stop: chasing losses, betting more than you can afford, borrowing to gamble, hiding play from family, or gambling to escape stress. If any of these sound familiar, set a deposit limit, take a cooling-off break, or self-exclude using the tools below.
Must be 19+ to play in Ontario. The regulated market is overseen by the AGCO and iGaming Ontario, and registered operators must offer deposit and time limits.
ConnexOntario gives free, confidential support 24/7 by phone, chat or text for anyone affected by gambling.
Support is free and confidential right across Canada — you don't need to be in crisis to reach out or to set limits early.
The Responsible Gambling Council offers self-assessments, tools and advice on keeping play safe before things escalate.
Set deposit and time limits and take cooling-off breaks from your account, and use provincial self-exclusion to lock yourself out.
Outside Ontario, play runs through your provincial platform — PlayNow, Play Alberta, Espacejeux, OLG.ca or Atlantic Lottery — each with its own self-exclusion.
Gambling is for entertainment, not income. You must be 19+ (18+ in Alberta, Manitoba and Québec) to gamble in Canada. Set deposit limits, take cooling-off breaks, and never chase losses. The services above are free and confidential. If you or someone you know has a gambling problem, reach out today. When the fun stops, stop.
Real questions from search, player-review threads and our hands-on session — answered clearly in plain en-CA, with no marketing copy and no hidden T&Cs. Facts match Relax Gaming's spec: 99.00% RTP, a 5,000× max win and no jackpot.
Book of 99 is a Relax Gaming video slot on a 5-reel, 3-row grid with 10 fixed paylines, themed on Ancient Greek myth with Odysseus as the top symbol. The book acts as both wild and scatter — it substitutes and it pays.
Land 3 or more books for 10 free spins, or fill the 99-book collection meter in the base game to trigger the same round. Before free spins, one character symbol is chosen at random and expands to fill its reel. RTP is a category-leading 99.00% and volatility is High.
Regulators don't publish per-title catalogues, so availability depends on each operator's live Ontario lobby — check the game list. LeoVegas' Canada-facing site currently lists Book of 99, and other AGCO / iGaming Ontario-registered operators may carry Relax Gaming titles.
Outside Ontario, whether you can play it depends on your provincial platform. We link verified operators above, each via a tracked affiliate link.
Every book (wild/scatter) you collect in the base game banks toward the 99-book collection meter. Reaching 99 triggers 10 free spins regardless of how many books landed on that spin — a second route into the bonus alongside the usual 3+ scatters.
Before the round begins, one character symbol is chosen at random to expand across its reel and pay scatter-style. Confirm the exact behaviour in the in-game rules.
You can play it for real money at Canadian-regulated casinos. In Ontario the market is regulated by the AGCO and iGaming Ontario, and Relax Gaming is a registered supplier there; outside Ontario you'd play through your provincial platform.
Offshore sites also list it, but licensed play is the safer route — you keep regulator recourse, self-exclusion and payout protection.
At a 99.00% RTP the long-run house edge is about 1% of turnover, so wagering C$100 through Book of 99 carries a theoretical cost of roughly C$1 — not C$1 off your deposit on every spin.
High volatility means the real short-session range is far wider: you can lose most of a C$100 bankroll on a cold run or hit a big free-spins line. Use the session-value calculator above to model spins and risk bands for your own stake.
Individual players are not typically prosecuted for using offshore or crypto casinos, so that isn't the practical risk. What you give up matters more.
Off a regulated site there's no provincial self-exclusion, no regulator to escalate a dispute to, and no guarantee a withdrawal is honoured. That's the calm case for sticking to AGCO / iGaming Ontario-regulated operators.
The published theoretical RTP is 99.00% — one of the highest in the market and a single published configuration. Relax Gaming doesn't publish a lower-RTP variant.
Operators can in principle run reduced builds, so open the in-game (i)/paytable and read the active RTP shown there before you deposit.
Yes. Landing 3 or more books during the free-spins round awards another 10 free spins, and the round can retrigger again from there.
The randomly chosen expanding symbol stays in play for the whole round, which is where the top wins build.
No. The 99.00% RTP is the same whether you bet C$0.20 or C$100 a spin — stake size doesn't change the odds or the return.
Bet a level your bankroll can sustain across a High-volatility game. A bigger stake only makes the swings larger, not the RTP better.
Relax Gaming states a maximum win of 5,000× your bet — C$5,000 from a C$1 spin. Some aggregators publish a simulated ceiling of up to 12,075× (about C$12,075 at C$1), but that's a simulated figure, not Relax Gaming's stated cap.
There's no jackpot and no feature buy — the max win is a fixed theoretical cap.
Only real-money play at a licensed casino can pay out; the free demo pays nothing and is for practice.
Relax Gaming is an established studio — MGA-licensed and a registered AGCO / iGaming Ontario supplier, a positive trust signal. That said, no game guarantees a win on a High-volatility slot.