SpinOn, the latest iGaming studio to join Yggdrasil’s renowned YGG Masters program, has unveiled the second addition to its portfolio, Book of Evil. The slot comes a few months after the launch and success of its first game, Gates of Thunder. Book of Evil is expected to build on the success of its predecessor with an excitingly horrifying adventure for players. With the latest release, SpinOn continues to leverage Yggdrasil’s vast network to make its mark and deliver exceptional gaming experiences.
SpinOn Unveils Eerie Book of Evil Slot Through Yggdrasil’s YGG Masters Program

Photo by Pixexid, CC by 4.0
Key Takeaways
- SpinOn launches its second slot, Book of Evil
- The slot release is in partnership with Yggdrasil through the YGG Masters program
- The slot features classic book-game free spins and expanding symbols
Secrets of An Ancient Graveyard
Book of Evil transports players to an old, spooky graveyard riddled with mystery and danger. Those brave enough can venture through its five-reel gates and embark on a bone-chilling journey for $0.20 to $50 per round. Ten paylines cut across the grid, holding the promise of funk and fortunes.
Beyond its intense horror theme, Book of Evil runs with a highly volatile math model. The variance is accompanied by adjustable RTP rates of 94.0%, 90.5%, and 86.0%. With its high variance and maximum win potential of $250,000, this slot is suited for thrill chasers seeking an adrenaline-fueled adventure and massive wins.
In Classic Book-Game Fashion
SpinOn fashions Book of Evil after Play’n Go’s acclaimed Book of Dead Slot and pays homage through its bonus feature. At the start of any base game round, a regular symbol can be selected to expand and create winning combinations; this includes Book icons, which act as wilds and scatters.
Three or more book symbols landing in the base game trigger ten free spins. One special symbol is chosen randomly to expand throughout the bonus round. As is the norm with most modern releases, Book of Evil offers the option to purchase the free spins bonus for 100x the wager.
Showcases Yggdrasil’s Advanced Technology
Book of Evil is more than just an electrifying SpinOn release – it showcases GATI (Game adaptation Tools & Interface), the Yggdrasil technology that drives its success. This cutting-edge toolkit enables YGG Masters partners to easily create and distribute content in multiple markets, abiding by their varying regulation standards.
SpinOn’s marketing team expressed excitement with the new release, stating, “We wanted to make a bold entrance with a heavily themed book game that defies the typical slot experience. Book of Evil might send shivers down your spine, but trust us – it’s worth braving your fears for the chance to win big in this thrilling new release!”
Lucas Michael Dunn is a prolific iGaming content writer with 8+ years of experience dissecting it all, from game and casino reviews to industry news, blogs, and guides. A psychology graduate and painter that transitioned into the iGaming world, his articles depend on proven data and tested insights to educate readers on the best gambling approaches. Beyond iGaming content craftsmanship, Lucas is an avid advocate for responsible play, focusing on empowering players to strike a balance between thrill and informed choices.
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