Thinking about giving Book of Stars a spin? We tested it thoroughly so you know what to expect. Developed by Greentube, Book of Stars arrives with a very high-variance maths model and a return-to-player rate of 95%. It's wrapped in a book of theme and plays out on a 5-reel grid running 30 paylines. If everything lines up, Book of Stars can pay up to 500,000x your bet. Dating back to 2020, it remains a regular pick. Here's how it stacks up.
Written by Rachel Kim · Last updated: January 2026
This slot, Book of Stars, is the work of Greentube, built around a book of theme. It runs on 5 reels and 30 paylines with very high volatility, and a published RTP of 95%.
Dig into the bonuses and Book of Stars starts to stand out. Look out for scatter symbols that unlock free spins and extra bonus rounds. The very high volatility means patience is rewarded — expect quiet spells broken by bigger hits. Overall it's a well-rounded slot that knows what it is.
At 95%, 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.
Very high volatility delivers the most extreme payout profile — long dry spells punctuated by potentially massive wins. Only recommended for experienced players with substantial bankrolls and high risk tolerance.
About 1 in 3 spins results in a win. This is a moderate hit frequency that balances win frequency with payout size.
Book of Stars 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 Stars by Greentube is a solid offering that delivers good entertainment value. The 95% RTP combined with very high volatility creates a well-balanced gaming experience.