RTPLEDGER
Book of 99

Book of 99 RTP — Relax Gaming

Relax GamingRelease year on record: 2021· Greek mythology (Odyssey)
See the full data ↓RTP matched a retained secondary snapshot · checked 16 Jul 2026
Primary recorded RTP
99%
92%96.2% database median99.5%
House edge
1%
Beats
99.9%
of 2,410 slots

What is the theoretical RTP of Book of 99 (Relax Gaming)?

Book of 99 by Relax Gaming has a primary theoretical RTP record of 99%. RTP Ledger's legacy value matched a retained snapshot from slot.report on . Because the legacy import's upstream source was not retained, this match does not prove two independent origins. The public link identifies the source database, not a game-specific record. At 99%, the theoretical house edge is 1%. RTP Ledger has not measured player returns or established which RTP version any casino runs.

Evidence definitions: methodology · source policy · claim evidence record

What stands out
  • The game RTP is 2.75 percentage points above the Relax Gaming median.
  • The recorded RTP is higher than 99.9% of the 2,410 games in the database.
  • The game RTP is 2.8 percentage points above the database median.
  • 75% of the game’s recorded key fields have an official or independent supporting source.
Key game data

The full record

Every field currently held in our dataset. A dash means we have no value on record; source status is reported separately and we do not guess.

Primary recorded RTP
99%
RTP range
—
House edge
1%
Volatility
High
Max win
12,075×
Layout
5×3
Ways to win
10 lines
Hit frequency
29.83%
Released
2021
Theme
Greek mythology (Odyssey)
Provider
Relax Gaming
Beats
99.9% of slots
Gameplay

Mechanics on record

Only mechanics present in our dataset are shown. Their source coverage varies; confirm gameplay details in the game's own rules.

Grid & lines

The recorded layout is 5×3 with 10 lines on record. Check the rules for the exact win evaluation.

Volatility

The recorded volatility label is high. It describes the expected distribution of outcomes, not what will happen in one session.

Max win

The top multiplier on record is 12,075× stake. It is a theoretical ceiling, not a typical or expected result.

Bonus features

Features on record

Feature labels currently held in our dataset. Each links to every tracked slot that shares the normalized label.

Expanding SymbolsBook Collection MeterFree SpinsRecord-High RTP
Data status

Where each figure comes from

Per tracked key field: source, confidence, and a checked date only where a qualifying source check is recorded. A secondary-snapshot match does not prove independent upstream origins. Unverified legacy values stay explicitly unverified.

Primary RTP
Retained secondary snapshot· slot.report· checked 16 Jul 2026
Max win
Retained secondary snapshot· slot.report· checked 16 Jul 2026
Volatility
Retained secondary snapshot· slot.report· checked 16 Jul 2026

How we source this · Source policy · Report an issue

RTP Ledger analysis

Our read on the numbers

At its primary recorded value of 99%, Book of 99 sits 2.51 points above the 96.49% average of the 19 Relax Gaming titles we track, and it ranks above 99.9% of the 2,410-slot database. The percentile and provider-average figures compare only values in the recorded dataset; inspect the source status before attribution.

Analysis — RTP Ledger Data Team · figures updated 11 Jul 2026
Studio benchmark

Book of 99 vs the Relax Gaming catalogue

How this title sits inside the 19 Relax Gaming slots in our database.

19
Relax Gaming slots
96.25%
Studio median RTP
96.49%
Studio average RTP
2
Titles with recorded ranges
median

Book of 99 (99%) against the Relax Gaming median (96.25%). See the full Relax Gaming catalogue →

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Wild ChapoRelax GamingRTP96.36%VolatilityMax win—Relax Gaming2021
Snake ArenaRelax GamingRTP96.25%VolatilityMax win2,759×Relax Gaming2020
Temple TumbleTemple TumbleRelax GamingRTP96.25%VolatilityMax win—Relax Gaming2019
Money TrainMoney TrainRelax GamingRTP96.2%VolatilityMax win20,000×Relax Gaming2019
Change history

Record changes

This list shows the available source events for the game record. Older history can be incomplete. RTP Ledger does not reconstruct missing events.

  1. 16 Jul 2026The legacy RTP value matched a retained secondary-source snapshot; the original import source was not retained.
  2. 16 Jul 2026The legacy volatility label matched a retained secondary-source snapshot; the original import source was not retained.
  3. 11 Jul 2026Book of 99's RTP Ledger data record was updated.
AdvertisementSponsored partners

Available cards are paid placements. Source-linked public terms are identified when documented; an unconfirmed referral value is never presented as an offer. This is not an RTP, safety or payout ranking.

Partners
3
Offers sourced
2
Live check
1
Sponsored partnerTerms snapshot
Shuffle
shuffle.com
Why it is featured

Clear public welcome mechanics with the important limits visible.

Documented public offerOperator source
100% first-deposit match up to $1,000
Minimum deposit
$20
Wagering
35× deposit + bonus
Maximum bet
$10

The public offer is sourced. Referral entitlement and country eligibility still require confirmation at Shuffle.

Checked Offer evidence
Referral / promo codeaces

Use this if signup asks for a code.

See Shuffle's live offer(opens in a new tab)
Affiliate link — RTP Ledger may earn a commission. Disclosure
18+ · T&Cs apply · Play responsibly
Sponsored partnerTerms snapshot
Rainbet
rainbet.com
Why it is featured

Paid partner shown with the referral-specific value intentionally left unclaimed.

Live terms requiredReferral value unconfirmed
Referral offer requires a live check
Referral value
Unconfirmed
Bonus amount
Not claimed
Before signup
Check live terms

RTP Ledger does not claim a referral bonus or amount. Rainbet controls eligibility and current referral terms.

Checked Terms record
Referral / promo codevip300

Use this if signup asks for a code.

Check Rainbet live terms(opens in a new tab)
Affiliate link — RTP Ledger may earn a commission. Disclosure
18+ · T&Cs apply · Play responsibly
Sponsored partnerTerms snapshot
Bitstarz
bitstarz.com
Why it is featured

Public four-deposit welcome-package mechanics with material limits visible.

Documented public offerOperator source
Up to €500 / 5 BTC + 180 free spins across 4 deposits
Welcome package
4 deposits · 180 free spins
First deposit
100% match + free spins
Bonus validity
7 days

No promo code is claimed. Wagering, maximum-bet and country restrictions apply.

Checked Offer evidence
Referral / promo codeSPINNER

Use this if signup asks for a code.

See BitStarz's live offer(opens in a new tab)
Affiliate link — RTP Ledger may earn a commission. Disclosure
18+ · T&Cs apply · Play responsibly

Sponsorship never changes RTP records, source status or editorial order.

18+ · Terms apply · Play responsibly

FAQ

Common questions

What is the RTP of Book of 99?

RTP Ledger records an RTP of 99% for Book of 99 by Relax Gaming, a theoretical house edge of 1%. The source-status section lists the status for the RTP value.

How volatile is Book of 99?

Relax Gaming is recorded as the studio behind Book of 99, whose volatility field is high. Individual sessions can swing far from the recorded RTP; RTP is a long-run average, not a per-session expectation. Check the source status for the volatility field.

What is the max win in Book of 99?

RTP Ledger records a top multiplier of 12,075× the stake. The source-status section lists the source for the top multiplier. The recorded multiplier is a theoretical maximum, not a typical or expected outcome.

Play responsibly

RTP is a long-run average, never a guarantee for any session. Slots are entertainment, not income. 18+ only — set a budget you can afford to lose and never chase losses.

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Learn more

Understand the numbers

What is RTP?RTP vs house edgeSlot volatilityOur methodologySource policy