The iconic horror-themed slot returns, packing electrifying new features, amplified bonuses, and monstrous win potential.
Innovative iGaming studio Big Time Gaming (BTG) has unleashed the next chapter in its fan-favourite horror series with Castle of Terror II — a thrilling sequel that promises even more scares, surprises, and spine-tingling rewards.
In this lab experiment–themed release, players find themselves in a gothic laboratory where monstrous creations and shocking outcomes await. Every spin brings the potential for explosive Bonus Respins, triggered by Scatters that unleash different features depending on where they land.
These include:
🧠 Brains – Adds extra Brains to the reels.
⚡ Alive – Applies a random Win Multiplier to all wins.
🔋 Shock – Wilds reveal Random Multipliers.
👹 Monster – A random symbol becomes Wild on reels two to five.
🧛 Horror – A random reel fills entirely with Wilds. 
During the Bonus Respin, additional Scatters can ignite Free Spins, where chaos truly takes over. Players start with 10 Free Spins — or even more if additional Scatters land — while a mutating Win Multiplier amplifies every win. The features combine dynamically, delivering unexpected and electrifying moments of gameplay.
For the bold, BTG offers Bonus Buy options, allowing instant entry into the experiment:
- 100× stake for 10 Free Spins with two bonuses
- 300× stake for 10 Enhanced Free Spins with three bonuses
“Castle of Terror II is a terrifying slot that’s not for the faint-hearted,” said Nik Robinson, CEO at Big Time Gaming. “Players find themselves in a spooky lab filled with creepy experiments — but if they can hold their nerve, there are plenty of bonus features to discover.”
“The real experimental stuff happens in the Free Spins,” Robinson added. “That’s where bonuses collide, chaos reigns, and big wins can emerge from the madness.”
With its cinematic visuals, unpredictable gameplay, and high-volatility math model, Castle of Terror II is poised to be a standout title this spooky season.
