Castle of Terror

Q: What is the RTP?

A top-tier 96.72% — above BTG's studio average.

Q: Castle of Terror vs Holy Diver / Lil Devil?

Castle of Terror: gothic horror, 61,720x max win, 96.72% RTP. Holy Diver: rock/Dio theme, 23,000x max win, Megaclusters up to 586,789 ways. Lil Devil: rock theme inspired by The Cult, 100,504x max win, Heartstopper Wilds. Three distinct dark BTG takes.

9.3/10

Release October 2020· Updated June 2026

BTG's gothic horror theme (Halloween, Oct 2020) — Megaways + Vampire Bonus, 61,720x max win. BetsRank score: 9.3/10.

RTP

96.72%

Volatility

Very High

Max Win

61 720x

Grid

6 reels Megaways

Bonus Buy

Megaways 117 649 waysCascading ReelsMultipliers progressifs FSVampire Bonus

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9.3

BetsRank Verdict

Hands-on testing by Alexandre Dubois — bonus tested, multiple sessions

A gothic horror release from Big Time Gaming timed for Halloween (October 2020). The 96.72% RTP sits at the top of BTG's range, above the studio average, with a 61,720x max win. It runs on 6 Megaways reels offering up to 117,649 ways to win, very high volatility, plus a Vampire Bonus and a progressive free spins multiplier that carries no cap.

Strengths

+Top-tier 96.72% RTP
+Very high 61,720x max win
+Distinctive gothic horror theme
+Original Vampire Bonus

To consider

−Very high volatility
−20€ max bet
−No bonus buy

About Castle of Terror

Released on 29 October 2020 (a Halloween launch), Castle of Terror explores gothic horror territory at BTG. It carries a top-tier 96.72% RTP (above BTG's average of 96.20%), very high volatility, and a 61,720x max win. Format is 6 Megaways reels offering up to 117,649 ways to win. The atmosphere is a haunted castle populated by vampires, ghosts and gargoyles.

The signature mechanic is the Vampire Bonus, a feature distinct from the regular free spins. Triggered by specific vampire symbols, it awards prizes and special multipliers tied to the theme. Free spins carry an uncapped progressive multiplier — a BTG signature.

Standard cascading reels apply throughout. Stakes run from 0.20€ to 20€. The 61,720x max win is reached through a combination of the Vampire Bonus and saturated free spins multipliers across the Megaways grid. There's no bonus buy.

Key mechanics

▸6 Megaways reels, up to 117,649 ways
▸Top-tier 96.72% RTP
▸Very high volatility
▸Distinctive Vampire Bonus
▸Cascading reels
▸Uncapped progressive free spins multiplier
▸Gothic horror theme
▸61,720x max win

❓Castle of Terror FAQ

What is the RTP?▾

A top-tier 96.

72% — above BTG's studio average.

How does the Vampire Bonus work?▾

It's a bonus distinct from the regular free spins, triggered by specific vampire symbols.

It awards prizes and special multipliers tied thematically to the vampire theme.

Castle of Terror vs Holy Diver / Lil Devil?▾

Castle of Terror: gothic horror, 61,720x max win, 96.

72% RTP. Holy Diver: rock/Dio theme, 23,000x max win, Megaclusters up to 586,789 ways. Lil Devil: rock theme inspired by The Cult, 100,504x max win, Heartstopper Wilds. Three distinct dark BTG takes.

Is it available in France?▾

Yes — at the crypto-friendly/anonymous casinos in BetsRank's top rankings that carry BTG.