Book of King Arthur

Book of King Arthur Slot Review

Slot Provider: Just For The Win

RTP: 96.1% | Variance: High | Maximum Win: 5,000x

Our Score: 7.4

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WHY YOU CAN TRUST THIS REVIEW: The information and opinions on this page are the result of an comprehensive process of information gathering and live game testing by the gambling experts who work at Find out more here.

About Book of King Arthur

Reviewed by:

Published Date: 1st May 2021

How We Review Slot Games

We test and rate all slot games across 5 criteria, assigning a score out of 10 for each and an overall score that is an average of the 5. To build an accurate assessment of each game we gather information from the supplier and play in real play or demo mode. Find out more.

Book of King Arthur is a 5 reel, 10 payline slot from Just For The Win with an historical theme that follows the traditional ‘Book Of’ slot format. A Book symbol represents both wild and scatter. Landing 3 or more triggers a free spins round with 10 spins in which one pay symbol is chosen as an expander. When it lands, if it can complete paylines, then it expands to full reel height. There is also a re-trigger if 3 or more scatters land again. The maximum win is 5,000x and spins start at 20p.

Book of King Arthur Game Information

  • RTP: 96.1% | 94.07% | 92.1%
  • Variance: High
  • Maximum Win: 5,000x
  • Progressive Jackpot: No
  • Reels: 5
  • Rows: 3
  • Paylines: 10
  • Minimum Stake: £0.20
  • Theme: History
  • Features: Wilds, Free Spins, Expanding Symbols

Testing Notes: Here’s What Happened When We Played Book of King Arthur

IMPORTANT: To give you an accurate assessment of the games we review our writers play 200 spins. Whilst this is a useful tool to help us review games and to give an example of what might happen when you play, keep in mind that 200 spins is only a very small sample and cannot be used to accurately predict what might happen over another 200 spins. The outcome of all slots play is always random.

Boom Or Bust? Our Session By The Numbers

I played 200 spins on Book of King Arthur for real money at Duelz Casino to test the game and this is what happened.

  • Stake Size: £0.2
  • Start balance: £48.92
  • End balance: £27.82
  • Biggest Win: 37x
  • Free Spins: 1
  • Session Time: 17 minutes 15 seconds

The format of Book of King Arthur is no different to many other Book of slots so it’s just a case of spinning til you land those 3 scatters. There were a few small wins on the way but nothing special. I unlocked free spins once with the 10 as the chosen expander. Total win, 37x. Not great, but not bad either. In some Book of slots it can take 300 or more spins before the bonus round unlocks, so from that perspective it’s a fair result.

Expander Symbol Reel in Book of King Arthur
Spinning the wheel to choose the Expanding symbol before free spins
A 37x win from free spins in Book of King Arthur
37x win from the free spins round

What We Liked

  • Janunty medieval soundtrack
  • Combined Wild/Scatters pay up to 200x
  • Re-triggerable Free spins
  • Expanding Symbols
  • Bonus Buy option

What We Didn't like

  • Too risky for those with less bankroll

Book of King Arthur Review Scores

  • Theme and Design 7
  • RTP and Variance 8
  • Maximum Win 7
  • Symbols and Paytable 8
  • Features and Gameplay 7

What Our Reviewer Says ...

"A classic 'Book of' game which doesn't stray from the standard gameplay format but has an alternative theme and crisp design."

Overall Score: 7.4

Theme & Design

Our Score 7

An Interesting Alternative Theme For A ‘Book of’ Slot

Just For The Win have gone for a floating cylindrical reel design in Book of King Arthur. It has a 3d look and sits in front of a regal-looking chamber with red carpet and stone columns, though to be honest you can’t see much of it. The backdrop hints that we are in the court of King Arthur rather than displaying it in full grandeur whilst the jaunty medieval soundtrack adds some appropriate atmosphere.

Book of King Arthur by Just For The Win
Book of King Arthur – in a regal setting

It’s a nice looking game but a little too retro for my own tastes. At least by moving to a different historical theme have taken the ‘Book of’ format away from its Egyptian roots.

RTP and Variance

Our Score 8

What is RTP?

RTP (Return to Player) refers to the amount a game will pay out in cash prizes expressed as a percentage of all the money wagered on that game. For example, a 96% RTP means a game will pay out £96 for every £100 wagered. This is an average number and will vary from one session to the next.  Read more here.

What is Variance?

Variance refers to how far a game will deviate from its RTP over time. High variance games deviate a lot and produce uneven win distributions and unexpected windfalls. Low variance games provide a more stable and even distribution of wins. Read more here.

The RTP for Book of King Arthur has at least 3 possible settings. I’ve seen it running at 96.1%, 94.07% and 92.1% at various slot sites. Here are the settings at 5 casinos we use to test games:

I would recommend playing at MrQ or Barz Casino for optimum RTP. If you play at 94.07% (Casumo) the difference is minimal but it’s better not to play at a lower setting.

Just For The Win has stuck with the format of ‘Book of’ games so this is a highly volatile one. It can be frustrating – they all are – and take a long time to unlock the bonus round but once there, the expander symbol can help trigger big wins.

Maximum Win

Our Score 7

What Is Maximum Win?

Maximum win refers to the maximum amount a player can win from one spin. It is expressed as a multiple of the stake. For example, where the maximum win is 100,000x, from a £1 stake, the maximum win would be £100,000.  

The top payout here is 5,000x which isn’t huge and doesn’t compare particularly well with the latest ‘Book of’ slots. Quickspin’s Book of Duat comes in at 32,760x, Relax Gaming’s Book of Power is at 15,000x and Nolimit City’s excellent Book of Shadows is 30,761x for example. However, it is on par with the original Book of Dead by Play n Go.

Explore Games With Similar RTP, Variance and Maximum Win

Like the numbers? Here are some more games you might want to try.

Slot SiteSupplierRTPVarianceTop Payout
Ghost of DeadPlay n Go96.21%High10,000xPlay Here
Scroll of DeadPlay n Go96.28%High7,500xPlay Here
Book of PowerRelax Gaming96.11%High15,000xPlay Here
Book of TimeHacksaw Gaming%High10,000xPlay Here
Book of DuatQuickspin96.27%HIgh32,760xPlay Here
Book of ShadowsNolimit City96.01%High30,338xPlay Here
Clash of CamelotPlay n Go96.28%High35,000xPlay Here

Symbols and Paytable

Our Score 8

The standard set up for a ‘Book of’ slot is 5 reels, 3 rows and 10 paylines. And that is exactly what you get here. Wins pay for 3 or more card symbols on a line from left to right, or 2 or more premiums on a line from left to right.

Another feature of the ‘Book of’ slot is high values in the paytable and you get that too, maxing out at a massive 500x for 5 of the top payer.

Book of King Arthur Paytable
Paytable with a 500x payout for the King symbol

The low payers are the cards, 10 through to Ace. These are valued at from 0.5x for 3 10s up to 15x for 5 Aces. The premiums are the shield, cup, sword and King Arthur himself. These are valued at from 0.5x for 2 shields up to 500x for 5 Arthurs.

The book symbol is the Wild and Scatter combined. So, it can substitute for any other symbol to complete a payline, but also triggers free spins when 3 or more land ANYWHERE on the reels. It has great value too at 2x, 40x or 200x for 3, 4 or 5 on a line on its own.

Features and Gameplay

Our Score 7

Classic ‘Book of’ Gameplay Throughout This Slot

There is nothing new about the free spins format here either.

Landing 3 or more of the Books will trigger the Free Spins round with 10 Free Spins awarded initially. Before the round begins, a round table spins to reveal which icon will become an Expanding Symbol.

Once into the bonus round, if by expanding that symbol can trigger wins, then it will do just that. Symbols in a payline with the expander do NOT have to be on adjacent reels OR start on reel 1. And if you land 3 or more books at any point, the round will re-trigger.

Boost Feature Gives You Expanding Wilds

As an add on, Just For The Win have created this extra feature. In regular play, the minimum bet is 20p but if you activate the Boost Feature, this increases to 40p. Doubling the bet in this way causes the Wild to expand to cover the whole reel in both base game and free spins round and increases your winning chances on every spin.

The Final Verdict

With its formulaic gameplay that follows the ‘Book of’ style to the letter, Book of King Arthur doesn’t offer much that is new in this popular series. However, if you are a fan of slots with Arthurian legend or medieval themes then it offers a nice alternative backdrop to a type of slot that is traditionally built on Ancient Egyptian or explorer narratives. The game ran smoothly for me and seemed to be slightly less volatile than other recent Book of slots which have proved harder to break down in our testing sessions. That might also be reflected in the 5,000x top win which is much lower than that of Book of Shadows or Duat for example. So, if you find games like those to be too volatile but want to stick with the ‘Book’ then Book of King Arthur represents a good alternative.

Useful Tips When Playing Book of King Arthur

Remember, online slots are games of chance, there is NO strategy that can improve your odds of winning. However, reading our review and following these tips will help you get the most out of your time playing this slot game.

1. Patience Is Key

Like all ‘Book of’ slots, patience is key to big wins in Book of King Arthur. I was lucky to crack the free spins in under 150 spins but it can take longer. And if its not your day, take a break!

2. Choose A Low Stake

Spinning at 20p per play in sensible here. It means your balance will give you more spins than when wagering at a high stake in a bid for glory.

3. Find A Bonus To Use On The Game

The match bonuses you can pick up at many of the sites we list are available to use on this game. You can deposit £100 at Grand Ivy for example and get a £100 match to play this game.

4. Play At Licensed Slot Sites

We also recommend that you play only at licensed UK slot sites like the ones in our lists. These sites are regulated by the Gambling Commission and have been audited for safety and fairness.

Who Made Book of King Arthur?

  • Name: Just For The Win
  • Established: 2016
  • UK License: Via Microgaming
  • Total Games: 45 +
  • Known For: Partnerships with Microgaming, high variance games
  • Popular Slots: Western Gold, Bandit and the Baron, Diamond Sands, Wolf Howl
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