Book of Darkness unfolds inside a ruined attic lit by dripping candles, its cracked walls hung with old portraits and its floorboards stained red. To the right stands a robed figure with a horned bird skull for a face, clutching a lantern in bony hands. My stake was $1.00, starting with $1,000 in credit.
Theme and Gameplay
The creepy toys and relics carry the top pays: a stitched golden teddy bear, a jewelled dagger, a melting white candle with a cross, a snarling black cat and a bell. Blood-red A, K, Q, J and 10 fill out the lower tier. The frame is an ornate gilt picture border, which suits the haunted-house mood nicely.
Slot Features
The Book acts as both wild and scatter, covering for every regular icon during base play and bonus rounds alike. Three Books open the Bonus, four upgrade to Super, while five reveal the Hidden Bonus. All three give 10 free spins with one expanding symbol picked at random from the ten regular icons, each equally likely.
VS reels are what sets this apart. When a line win runs through VS reels, their values combine, and that total becomes the line’s multiplier; any VS reel beyond the last matching symbol is ignored. They help with expansions too: natural reels showing the chosen symbol plus VS reels need to reach two reels for the premiums or three for the card ranks, and at least one natural reel must be present, since VS reels can’t expand a symbol by themselves.
During Super Bonus spins, each VS landing stays fixed until the feature finishes. Hidden Bonus rounds start with one sticky VS reel already in place.
RTP and Win Potential
An extra chance mode charges more per round but lands Books more often, and either of the first two tiers can be purchased outright. Hitting the top win cap ends a round at once. Stacking VS multipliers keep the swings big.
My Thoughts On This Slot
Book of Darkness gives the familiar expanding-symbol formula a genuinely new twist. VS reels add real depth, and the three-tier bonus makes every extra Book feel meaningful. The horror art is detailed without being gory.
The expansion rules are more complex than in a classic book game, so it’s worth reading the paytable before playing.