Castle of Terror

|Big Time Gaming|2022-10-19|RTP: 96.73 %
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Game provider
Big Time Gaming
Castle of Terror
Feature Buy
Game type
Video Slots
Mobile version
Grid slot
Sticky wilds
Free spins
Bonus game
Very high
Progressive jackpot
Min. bet
Random Feature
Max. bet
Maximum win
Last update
September 28, 2022


3 votes - 3.67/5.00

Tread carefully into a spooky castle atop the hill, where visitors are welcomed with a fanged smile on the video slot from Big Time Gaming. Castle of Terror features six reels and four rows with 4,096 ways to pay and random wild transformations with an increasing win multiplier. Explore your way into a free spins bonus, with random wild transformations on every spin, or trigger the enhanced feature for bigger multipliers and wins with a bite of up to 60,000x your bet.

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Slot Details

Castle of Terror is a horror-themed video slot with 6 reels, 4 rows, and 4,096 ways to pay. Wins are awarded for matching two or more symbols in succession, starting from the leftmost reel to the right. You can enter the Castle from 0.20 to 15 credits per spin (max bet may vary). Castle of Terror has a very-high volatility rating (5/5) and a 96.73% RTP.

The game comes with a traditional horror theme you might find in a Hammer Horror classic, with ominous music and a spooky castle with an overpowering look towards the town below. The suspenseful tone comes to life during the free spins, and night draws against the lit Castle for an eerie background.

castle of Terror Slot Screenshot
Castle of Terror Slot – Base Game

The pay symbols start at the low end with 9, 10, J, Q, K and A, awarding from 0.3x to 0.5x your bet for matching six across the reels. Four characters from the Castle of Terror follow; the Gardener, Maid, and Gentleman will pay from 0.6x to 1x your stake for six-of-a-kind, and in true Big Time Gaming fashion, the Lady represents BTG’s high-paying symbol, which pays 50x your bet for a spread of six.

Wild symbols appear as a W from the Holy Water feature and will substitute all others except for the bonus scatter, represented by the Castle itself. There are two types of Castle scatter, silver and gold. Land three castle scatters on a spin to trigger the free spins bonus. If one of the three is a gold scatter, the enhanced version of the free spins bonus will activate.

Castle of Terror Slot Demo Video

Castle of Terror Slot Demo – All Features

Castle of Terror Slot Features

It’s not often Big Time Gaming diverts its course from their innovative Megaways and Megaclusters march, and the first daring glance at Castle of Terror may remind you of Wild Flower. Let’s sneak a brave peek into the Castle of Terror and see what surprises may lurk in the darkness.

Your basic spin will see you connecting wins by matching symbols from left to right across the reels. At random, the Holy Water feature can activate and smash a vial of holy water as the reels spin, highlighting two or more positions anywhere on reels two, three, four, or five. Should a Lady, Gentleman, Maid or Gardener land in a marked position, they transform into a wild symbol. Each character turned will also increase a win multiplier by x1 increments.

Castle of Terror Slot Screenshot
Castle of Terror Slot – Holy Water Feature

Big Time Gaming’s Win Exchange makes a return in Castle of Terror, allowing players to choose to gamble or swap wins for features. You can swap any win in excess of 100x your bet for entry into the Free Spins Bonus. The exchange will deduct 100x stake from your total win in return for 12 Free Spins and any remaining balance is added to your win total. In turn, wins from 25x to 100x stake can be risked on a Free Spins Gamble Wheel with red and green sections. Losing a gamble will forfeit your winnings and return to the main game, whilst landing on a green area will win the gamble and trigger the bonus.

Land three silver castle scatters to trigger the Castle of Terror Free Spins. During the round, the Holy Water feature activates on every spin, and each transformed symbol is collected in meters on either side of the reels. The win multiplier does not reset between spins and is increased by x1 increments with each transformation as in the base game. Transform twenty characters during the round to trigger an extra six free spins, with no limits.

castle of Terror Slot Screenshot
Castle of Terror Slot – Free Spins

Should you be lucky enough to land a gold castle scatter on a trigger, you will be blessed with the Mega Scatter Enhanced Free Spins. For this version of the bonus, each transformation will increase the win multiplier by x2 increments for double the multiplying potential of the standard free spins round.

Where available, Castle of Terror comes with a Bonus Buy feature with a slightly improved RTP rating of 96.73%. For a fixed amount, you can purchase one of two following options:

  • Castle of Terror Free Spins | 70x Bet: Activates instant access to the regular free spins bonus.
  • Castle of Terror Enhanced Free Spins | 200x Bet: Triggers the enhanced version of the free spins.

Final Verdict

Castle of Terror is a fun game for fans of old-school horror. The Holy Water feature turns the occupants of the Castle into their vampire versions, transforming symbols into wilds as they reveal their monstrous selves, which weaves the feature nicely into the theme. Castle of Terror could be seen as somewhat of a sequel to Wild Flower but is a different beast once you get passed the familiar format. The volatility dictates entering the Castle of Terror may not be for the faint-hearted, but a keen 96.72% RTP will carry a hypnotic allure for many.


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