Our review of Book of Halloween cuts through the marketing and looks at what matters: how it plays and how it pays. This is a Inspired Gaming slot game, sitting firmly in the a very high volatility profile bracket and paying back a published RTP of 96.23%. It first went live in 2019 and still earns its place today. The maximum win sits at 250,000x, so there's serious upside on the table. It's wrapped in a halloween and book of theme and plays out on 5 reels and 25 paylines. The full verdict is below.
Written by Sarah Mitchell · Last updated: January 2026
At its core, Book of Halloween is a game produced by Inspired Gaming. Presentation-wise it's dressed up with a halloween and book of theme, and it leans toward a very high-variance maths model at a published RTP of 96.23%. Under the hood you'll find a 5-reel grid running 25 paylines.
The mechanics are what make Book of Halloween interesting. 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. On balance, Book of Halloween is a dependable option worth a few spins in the demo first.
The RTP of 96.23% is right around the industry average of ~96%. This represents a fair return that's in line with what most modern slots offer.
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 Halloween 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.
3.1 / 5 — Good
Book of Halloween by Inspired Gaming is a solid offering that delivers good entertainment value. The 96.23% RTP combined with very high volatility creates a well-balanced gaming experience.