Curious what Book of Ruby actually feels like to play? Here's our full, no-fluff take. Retro Gaming are the developer behind it, tuning the title for high variance, with an RTP of 95.2%. It first went live in 2022 and still earns its place today. It's themed around book of and plays out on 5 reels and 40 paylines. The maximum win sits at 5,000x, so there's serious upside on the table. Here's how it stacks up.
Written by Michael Torres · Last updated: February 2026
At its core, Book of Ruby is a game produced by Retro Gaming, leaning into a book of aesthetic. It runs on a 5-reel grid running 40 paylines with high volatility, and 95.2% RTP.
The mechanics are what make Book of Ruby interesting. Look out for scatter symbols that unlock free spins and extra bonus rounds. The high volatility means patience is rewarded — expect quiet spells broken by bigger hits. On balance, Book of Ruby is a dependable option worth a few spins in the demo first.
At 95.2%, the RTP is slightly below the industry average of ~96%. While this is typical for many popular slots, players should be aware of the slightly lower theoretical return.
High volatility means longer gaps between wins, but when wins do land, they can be significantly larger. A bigger bankroll and patience are recommended for this type of slot.
About 1 in 3 spins results in a win. This is a moderate hit frequency that balances win frequency with payout size.
Book of Ruby features scatter symbols that can trigger free spins rounds. Landing the required number of scatter symbols anywhere on the reels activates the free spins feature, giving you extra chances to win without additional bets. During free spins, special modifiers may apply to boost your winning potential.
3.0 / 5 — Good
Book of Ruby by Retro Gaming is a solid offering that delivers good entertainment value. The 95.2% RTP combined with high volatility creates a well-balanced gaming experience.