Welcome to our deep dive on Book of Ra — the demo, the maths, and whether it earns a spot in your rotation. This is a Greentube slot, sitting firmly in the a high-variance maths model bracket and paying back a published RTP of 94.26%. If everything lines up, Book of Ra can pay up to 180,576x your bet. Originally released in 2017, it has aged well. You get 15 paylines across 5 reels, all dressed up with a book of theme. The full verdict is below.
Written by Sophie Williams · Last updated: March 2026
Book of Ra comes to us from Greentube. Presentation-wise it's leaning into a book of aesthetic, and it leans toward a high-variance maths model at an RTP of 94.26%. Under the hood you'll find a 5-reel grid running 15 paylines.
The mechanics are what make Book of Ra 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. Overall it's a straightforward game that knows what it is.
The RTP of 94.26% is below the industry average of ~96%. This is common for older slots or those with special features. The lower RTP may be offset by unique mechanics or higher maximum win potential.
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 Ra 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.
2.6 / 5 — Average
Book of Ra by Greentube provides a straightforward slot experience. While it may not break new ground, it offers high volatility gameplay that will appeal to certain player preferences.