Castle Builder slots review

Developer: Rabcat

Reels: Five

Paylines: 15

Maximum bet: $15

Bonus rounds: Yes

RTP: 96.47 per cent

Developed for the Microgaming Quickfire platform by Rabcat, the Castle Builder online slots game is unique, innovative and full of interactive bonus features. Keep reading to find out more, or sign up at one of our top-ranked Microgaming casinos below to start exploring this quirky and immersive video slot for yourself.

How to play Castle Builder online

This game is all about the story, the features and the jackpots. You are a builder who moves from realm to realm raising royal castles upon the king’s request, collecting the finest available construction materials along the way. Once you complete a job, you collect your payment and move on to the next kingdom. The bigger and better the castle, the richer the rewards on offer.

Castle Builder betting options

The Castle Builder slot is laid out with the standard five reels and three rows of symbols. Players can select up to 15 paylines and choose from eight coin options (0.01, 0.02, 0.05, 0.10, 0.20, 0.25, 0.50 and 1.00). The coin bet is fixed at one unit per win line, so the minimum bet is $0.15 and the maximum bet is $15.

There are eight standard symbols, including four character royals that pay with as little as a two-part combination. The payouts below are listed according to a $15 max bet.

Locked vault
Five = $20,000
Four = $2000
Three = $200

Treasure chest
Five = $1000
Four = $200
Three = $25

Jewellery box
Five = $500
Four = $100
Three = $15

Money bag
Five = $250
Four = $50
Three = $10

King
Five = $100
Four = $50
Three = $8
Two = $5

Queen
Five = $75
Four = $25
Three = $8
Two = $4

Jack
Five = $50
Four = $10
Three = $5
Two = $3

Ten
Five = $10
Four = $5
Three = $3
Two = $2

There is also a Castle Builder wild symbol that can substitute for any of the above to complete or lengthen a winning combination. Five wilds on a single payline triggers the $20,000 jackpot line win (i.e. the same as landing a five of a kind with the top-paying vault symbol).

How the building symbols work

The building symbols are the core feature of the Castle Builder slots. Whenever you land two or more of these special icons in a consecutive left-to-right combo on an active line, they contribute materials to your current castle project and further the construction progress.

The bigger the building symbols sequence, the more precious the construction materials become. Two symbols create iron, three make bronze, four form silver and five get you gold. The quality of the metals used determines the value of the castle and thus the size of the cash jackpots on offer when the job is completed.

Castle Builder bonus features

Finishing a castle project unlocks the bonus round, in which you must select one of three potential suitors for the hand of the heir to the throne. The candidate you choose determines which of the three Castle Builder jackpots you win:

The rich guy – Set up the royal heir with the wealthiest suitor to score the top jackpot.

The average joe – If the royal highness winds up with an ordinary working lad or lass, you must settle for the middle jackpot.

The pauper – Pick the one who’s dirt broke and you get the smallest of the three cash prizes. It’s only fair.

The depth of the suitor’s pockets is only revealed after the royal wedding ceremony, so choose wisely.

Where to play Castle Builder real money slots online

As a feature title on the Quickfire instant play platform, Castle Builder is available for real cash betting at all leading Microgaming casinos. That includes a number of the world’s top slots sites, as listed in the casino table at the top of this page.

Each of these safe online casinos offers a quick and easy instant play option that requires no downloads and runs on any Flash-enabled web browser. Some, including Jackpot City, also have a free casino software suite for desktop download on Windows PC.

Prefer to play on mobile? Castle Builder is optimised for HTML5 browser player on most smartphone and tablet systems, including Apple iOS, Google Android and Windows Phone. Everything is designed for easy touch-based play in Chrome or Safari, so you don’t have to download any casino apps.

Castle Builder rating and features – our verdict

One can only applaud Rabcat’s ambition here. Few internet slots games come with such an original and interesting set of features. The construction side game and the progressive jackpots keep you invested in every spin and provide an immersive, interactive style of gameplay that you don’t get with a run-of-the-mill online slot. The game map adds a real fantasy element and the level progression is reminiscent of a video game. The return to player (RTP) percentage might not be as high as in some other games, and a free spins bonus would be nice, but this is a great option overall for players who demand modern features and top-shelf production values.

We rate it 4/5