About book slots
A "Book of" slot usually follows a well-known design: the book symbol is both wild and scatter, and in free spins one symbol is chosen to expand across whole reels. Many studios have their own version, which is why the list is long.
Because the designs are so similar, the numbers are what separate them. Compare the RTP versions and the max win of each game in the list.
RTP of book slots
The highest headline RTPs among book slots are Book of Pyramids by BGaming (97.13%), Book of Cats MEGAWAYS by BGaming (97.07%) and Book of Panda MEGAWAYS by BGaming (97.07%). The average headline RTP across all 44 is 96.23%, and the lowest is 94% on Book of Evil.
7 of them (16%) are published in more than one RTP version, so the return depends on the version an operator runs. The widest gap is on Rich Wilde and the Tome of Madness: from 96.59% down to 84.5%.
Volatility and max win
Volatility is published for 34 of the 44 games: 4 medium, 17 high and 13 very high.
The largest published max wins are 30,338× on Book of Shadows, 20,000× on Book of Kingdoms and 13,752× on Book of Leo Quattro. The median max win of the 13 games that publish one is 5,521×. A max win is a rare ceiling, not a result to expect.
Studios, years and free demos
9 studios make the games in this list. The most represented are Pragmatic Play with 8 (average RTP 96.46%), Endorphina with 8 (average RTP 95.96%) and Stakelogic with 7 (average RTP 96.21%).
Release years run from 2016 to 2026; the newest are Book of Hidden Tombs (2026), Tome of the Lost (2025) and Book of Monsters (2025).
30 of the 44 (68%) have a free official demo that runs on their page with no sign-up.