Book of 99 Slot Review 2026
Opening
Book of 99 is a high-volatility slot from Relax Gaming that stands out for its unusually generous 99% RTP—among the highest you'll find in online casinos across Canada. The 5000× max win ceiling appeals to players chasing substantial payouts, though you'll need patience and a solid bankroll to ride out the dry spells medium-high volatility brings. If you're tired of slots that grind your balance down to nothing, this is worth a closer look.
Key Facts
- Provider: Relax Gaming
- RTP: 99% (exceptionally high for video slots)
- Volatility: Medium-High
- Max win: 5000× your bet
- Reels × rows: 5 × 3 (standard)
- Paylines: 10 fixed
- Min/max bet: Typically 0.10–50 CAD per spin (varies by operator)
- Features: Expanding symbols, free spins, wild multipliers
- Theme: Greek mythology (book-style, adventure vibes)
- Bonus buy: Likely available at major operators (cost: typically 75–100× your bet)
- Release: 2021
- Ontario (iGO): Available at regulated casinos
- Demo play: Yes, free-play mode available
How Book of 99 Plays
Book of 99 keeps mechanics straightforward: land matching symbols across the 10 fixed paylines to win. Wins cascade from left to right, and the slot rewards patience with a 99% RTP—meaning that, theoretically, for every 100 CAD wagered over millions of spins, the slot returns 99 CAD to players. That's 1% house edge, which is competitive.
The Greek mythology theme is purely cosmetic; gameplay doesn't pivot on story beats. Symbols include gods, treasures, and the classic "Book" scatter, which is your gateway to the best payouts.
Expanding Symbols and Cascades
When expanding symbols land (typically the high-value god icons), they can stretch to fill an entire reel, dramatically increasing win potential. After a win, symbols may cascade off-screen, new symbols drop in, and the cycle repeats until no further matches form. This is where lucky spins balloon into 1000×+ wins.
Free Spins and Feature Triggers
Landing three or more book scatters anywhere on the reels triggers the free-spin mode. Relax Gaming typically awards 8–15 free spins depending on the operator's configuration, and free spins retain the expanding-symbol feature, often with bonus multipliers applied.
What Happens Inside the Bonus Round
During free spins, expanding symbols are more likely to hit, and some operators configure the round with sticky wilds (symbols that stay locked for subsequent spins) or multiplier stacking. Each cascade in the bonus round can multiply your win—hitting a 2× or 3× multiplier and landing expanding gods on the same spin is how you reach the 5000× ceiling.
Retriggering free spins (landing scatters again during the round) resets the count, so longer sessions in the bonus are possible but not guaranteed.
RTP 99%: What That Means For Your Bankroll
A 99% RTP is genuinely above-average. Most video slots run 94–97% RTP, so Book of 99 cuts the house edge roughly in half compared to standard offerings. However, RTP only matters over millions of spins—in a single session, you can lose 50% of your balance or win 500%, and RTP doesn't predict either outcome.
Think of it this way: if you wage 1,000 CAD over three months at this slot, you'd expect to cash out roughly 990 CAD (the other 10 CAD is the theoretical house take). That's better odds than many slots, but it's not a ticket to profit.
Why High RTP Matters
Slots with lower RTPs (92–94%) are more forgiving to casinos but punish long-term play. A 99% RTP makes it viable to play longer without your balance evaporating as quickly, assuming you set loss limits and stick to them.
Volatility and Bankroll Planning
Medium-high volatility means Book of 99 doesn't reward every spin; you'll spin 10–20 times without a win, then suddenly land a 50×, 100×, or (if you're lucky) a 500×+ win. This rhythm rewards bigger starting balances.
Recommended Starting Bankroll
For medium-high volatility, plan for 200–500× your base bet as a session budget. If you're betting 0.50 CAD per spin, aim for a 100–250 CAD session roll. This gives you 200–500 spins to catch a good feature or expanding-symbol cascade without busting.
Avoid maxing your bet during losing streaks—a common mistake that empties accounts fast.
Theme, Graphics, and Sound Design
Book of 99 leans into Greek mythology with Zeus, Athena, and treasure-chest icons rendered in clean, modern 3D. The visuals are crisp and mobile-friendly; animations on wins feel polished without being slow. Sound effects are muted by default on most mobile browsers, but desktop play includes ambient lute music that's inoffensive.
The theming doesn't affect gameplay, but it does set the mood. If mythology-themed slots appeal to you, the aesthetic holds up well.
Where to Play Book of 99 in Canada
Ontario (iGO-Regulated)
- bet365.ca: Offers Book of 99 with 99% RTP config; accepts Interac e-Transfer and MuchBetter
- FanDuel Casino (Ontario): Carries the title; fast withdrawals via Interac
- DraftKings Casino (Ontario): Also available; similar payment speeds
Across Canada (Regulated Provinces + Multi-Licence Operators)
Book of 99 is widely available at major multi-jurisdictional casinos (Bodog CA-facing, Rivalry, theScore Bet's casino vertical if launched). Check your province's regulator site for licensed operators in your jurisdiction.
Bonus Context
Most iGO operators pair Book of 99 availability with welcome packages (150–300% up to 1,500 CAD) and free-spin offers. Read the playthrough terms before claiming; 35–50× wagering requirements are standard.
Bonus Buy and Feature Accessibility
Most operators offer a bonus-buy button on Book of 99, letting you skip the scatter grind and jump straight into free spins. Cost: typically 75–100× your base bet (e.g., 37.50 CAD if you're betting 0.50 CAD).
Is It Worth It?
Bonus buy is a personal choice. If you've just blown 50 spins without a scatter and you're impatient, a one-time 75× buy can feel justified. Statistically, you're paying a premium for convenience—the RNG doesn't care if you buy in or wait. Over 1,000 spins, bonus-buy usage doesn't increase long-term returns.
Demo and Free Play Options
Yes, Book of 99 offers a fully playable demo mode on most casino sites. The demo runs with the same mechanics and RTP as real-money play, so you can test your bankroll strategy risk-free. Some operators require registration (no deposit) to access the demo; others let you play anonymously.
Use the demo to:
- Get comfortable with the expanding-symbol mechanic
- Test your session-length preferences
- Decide whether medium-high volatility feels right for you
Tips for Playing High-Volatility Slots
- Set a loss limit before you start. Decide the maximum you're comfortable losing in a session and stop when you hit it.
- Don't chase losses. If you've blown your session bankroll, wait. Don't withdraw from savings.
- Avoid increasing bets after losses. It's human nature, but it accelerates depletion in volatile slots.
- Play shorter sessions. High-volatility play is exhausting. 30–60 minutes is healthy.
- Don't rely on bonus buy for comebacks. Buying your way to free spins doesn't improve long-term EV; it just shortens your session.
Similar Slots Worth Exploring
- Gates of Olympus (Pragmatic Play) — 96.5% RTP, similar Greek theme, higher volatility. Max win 5000×.
- Book of Dead (Play'n GO) — The OG book-style slot, 96% RTP, more accessible volatility. Available on almost every CA casino.
- Immortal Romance (Microgaming) — 96.86% RTP, vampire theme, medium volatility. Strong feature frequency.
- Legacy of Egypt (Pragmatic Play) — 96.4% RTP, Egyptian theme, expanding symbols. Good stepping stone before high-volatility play.
Frequently Asked Questions
What's the exact RTP of Book of 99?
Book of 99 ships with a 99% RTP (theoretical). Some operators may configure alternate RTP versions (98%, 96%, etc.), but 99% is the standard and most commonly advertised.
Can I play Book of 99 on my phone?
Yes. Relax Gaming slots are fully mobile-optimised. Download the casino's iOS or Android app, or play via mobile browser.
Is Book of 99 available on iGaming Ontario sites?
Yes. Multiple AGCO-regulated casinos carry it, including bet365.ca, FanDuel, and DraftKings Casino Ontario.
What's the max win I can realistically expect?
The ceiling is 5000× your bet. Realistically, most sessions cap at 500–1000× if you hit a good bonus round. The 5000× is rare—a once-per-thousands-of-sessions outcome. Budget accordingly.
Does Book of 99 have a progressive jackpot?
No. Book of 99 is a fixed-payline slot without a connected or standalone progressive. All wins are determined by paylines and features.
Is there a Book of 99 bonus buy cost?
Yes, typically 75–100× your bet on operators that offer it. Not all casinos enable this feature, so check before playing.
Verdict: Is Book of 99 Worth Playing?
Book of 99 suits you if you:
- Enjoy Greek mythology themes and book-style mechanics
- Have a bankroll of at least 100+ CAD and aren't afraid to lose it
- Can tolerate dry spells between wins (medium-high volatility)
- Want a mathematically honest RTP and are willing to play long-term
- Like feature-driven slots (free spins, expanding symbols)
Skip Book of 99 if you:
- Prefer frequent, small wins (low-volatility slots)
- Have a limited budget (under 50 CAD)
- Want guaranteed wins or a "system" (no such thing exists)
- Are new to slots and need something gentler
Final call: Book of 99 is a well-designed, fairly priced high-volatility slot. The 99% RTP is genuinely above-average, and the expanding-symbol mechanic delivers satisfying cascades when they hit. If you have the bankroll and patience for medium-high volatility, it's a solid choice on any regulated Canadian casino.
Responsible Gambling Reminder
Slot results are determined by random number generators. RTP is a theoretical average only—it matters over millions of spins, not in individual sessions. Always set deposit limits, loss limits, and time limits before you play. If gambling is causing you harm, help is available:
- Ontario: ConnexOntario 1-866-531-2600
- Quebec: Jeu : aide et référence 1-800-461-0140
- British Columbia: BC Responsible & Problem Gambling 1-888-795-6111
- Alberta: AHS Addiction Helpline 1-866-332-2322
- Other provinces: ProblemGamblingHelpline.ca
19+ in most provinces; 18+ in Alberta, Manitoba, and Quebec.