--- title: "Book of 99 Slot: Free Demo & 99.0% RTP | SLOTyi" description: "Play the Book of 99 slot demo free by Relax Gaming — 99.0% RTP, medium volatility. Bonus features and where to play." url: "https://slotyi.com/en-ph/slot/book-of-99" language: "en-PH" image: "https://slotyi.com/static/img/slotyidotcom.jpg" --- # Book of 99 Slot — Free Demo & Review Play the **Book of 99** slot for free in demo mode below. Developed by **Relax Gaming**, it is a greek mythology, books themed game. It has a **99.0% RTP** and **Medium volatility**. Try every feature with virtual credits — no download, deposit or sign-up required. Book of 99 Free demo for entertainment only. 18+. Please gamble responsibly. ## Book of 99 Slot Facts | Game | Book of 99 | | --- | --- | | Provider | [Relax Gaming](https://slotyi.com/en-ph/slots/provider/relax-gaming) | | RTP | 99.0% | | Volatility | Medium | | Theme | Greek Mythology, Books · [all Greek Mythology slot games](https://slotyi.com/en-ph/slots/theme/greek-mythology) | | Min bet | $0.1 | | Max bet | $100.0 | | Features | Expanding Symbols, Free Spins | | Release date | May 2021 · [all 2021 releases](https://slotyi.com/en-ph/slots/new-slots-2021) | ## About the Book of 99 Slot Book of 99 by Relax Gaming is a greek mythology, books themed online slot released in 2021. Its theoretical return to player (RTP) sits at 99.0%, slightly above the industry average of roughly 96%. With medium volatility, wins strike a balance between frequency and size. You can test all of this risk-free in the free demo above before deciding whether the game suits your style. ## How to Play the Book of 99 Demo 1. Click the **“Play Book of 99 Demo”** button above to launch the game. 2. Set your bet size anywhere between $0.1 and $100.0 using the game controls. 3. Spin the reels with virtual credits and explore the Expanding Symbols, Free Spins. 4. When you are ready to play for real, check our [recommended casino sites](https://slotyi.com/en-ph/casino-sites/). ## Book of 99 Bonus Features - Expanding Symbols - Free Spins ## Book of 99 Slot FAQ ### Can I play the Book of 99 slot for free? Yes. You can play the Book of 99 demo for free at SLOTyi using virtual credits — no download, deposit or registration required. ### What is the RTP of Book of 99? The Book of 99 slot has a 99.0% RTP (return to player), developed by Relax Gaming. ### Is Book of 99 a high volatility slot? Book of 99 is a medium-volatility slot, which shapes how often and how large its wins tend to land. ### What features does the Book of 99 slot have? Book of 99's main bonus features include Expanding Symbols, Free Spins. ### Who makes the Book of 99 slot? Book of 99 was created by the game studio Relax Gaming and released in 2021. ## Where to Play Book of 99 for Real Money Ready to move on from the demo? Compare vetted, bonus-loaded casinos where you can play Book of 99 with real stakes. [Compare Casino Sites →](https://slotyi.com/en-ph/casino-sites/) ## Explore Slots Like Book of 99 Same studio - [All Relax Gaming slot games (51)](https://slotyi.com/en-ph/slots/provider/relax-gaming) - [Slots released in 2021](https://slotyi.com/en-ph/slots/new-slots-2021) Same theme - [Greek Mythology slot games](https://slotyi.com/en-ph/slots/theme/greek-mythology) Same features - [Free Spins Slots](https://slotyi.com/en-ph/slots/feature/free-spins-slots) - [Expanding Wilds Slots](https://slotyi.com/en-ph/slots/feature/expanding-wilds-slots) ## Slot Games Similar to Book of 99 [Money Train 2 Relax Gaming · 96.4% RTP](https://slotyi.com/en-ph/slot/money-train-2) [Iron Bank Relax Gaming · 96.2% RTP](https://slotyi.com/en-ph/slot/iron-bank) [Caveman Bob Relax Gaming · 96.5% RTP](https://slotyi.com/en-ph/slot/caveman-bob) [Money Train Relax Gaming · 96.2% RTP](https://slotyi.com/en-ph/slot/money-train) [Beast Mode Relax Gaming · 96.32% RTP](https://slotyi.com/en-ph/slot/beast-mode) [Money Cart 2 Relax Gaming · 98.0% RTP](https://slotyi.com/en-ph/slot/money-cart-2) [Wild Chapo Relax Gaming · 96.36% RTP](https://slotyi.com/en-ph/slot/wild-chapo) [Dead Man’s Trail Relax Gaming · 96.29% RTP](https://slotyi.com/en-ph/slot/dead-mans-trail) Compiled and checked by the [SLOTyi Editorial Team](https://slotyi.com/en-ph/editorial-team) · Last updated 07 October 2026. RTP, volatility and feature data for Book of 99 is taken from Relax Gaming's published paytable and fact sheet; where a studio ships several RTP configurations we list the default, and the casino you play at may run a lower one. Spotted an error? [Report it](mailto:manager@slotyi.com). For informational and entertainment purposes only. 18+ · Please gamble responsibly. ```json {"@context":"https://schema.org","@type":"VideoGame","@id":"https://slotyi.com/slot/book-of-99#game","name":"Book of 99","url":"https://slotyi.com/slot/book-of-99","gamePlatform":"Web browser","applicationCategory":"Game","operatingSystem":"Any","genre":"Greek Mythology, Books","image":"https://slotyi.com/static/img/slotyidotcom.jpg","author":{"@type":"Organization","name":"Relax Gaming"},"publisher":{"@type":"Organization","name":"Relax Gaming"},"description":"Play the Book of 99 slot demo free by Relax Gaming — 99.0% RTP, medium volatility. 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