Book of Spies: Mission X Slot Review

Want to become a secret agent? You can with the Book of Spies: Mission X slot. Powered by Spearhead Studios and Nolimit City, this 5 reel game begins with 1,024 ways to win. Mystery symbols will increase the number of ways to win up to 5,488 in the base game. There are also wilds which nudge which increase the multiplier up to 14x. In the Secret Agent Free Spins feature, you can play with up to 42 free spins and a special expanding symbol. With wild multipliers and mystery symbols, the number of ways can increase to 16,807. Book of Spies: Mission X also offers 27,000 x stake wins on each spin.

Where to Play Book of Spies: Mission X Slot

Casushi Casino
  • 750 + Slots
  • £50 Bonus + 50 Bonus Spins
  • PayPal Cashouts
T&C Apply

18+. New players only. 100% bonus on first deposit up to £50 & 50 Bonus Spins (30 spins on day 1, 10 on day 2, 10 on day 3) for Rich Wilde and the Book of Dead slot only. Min first deposit of £20. Max bonus £50. Max bonus bet £5. Max bonus cash-out £250. 40x wagering requirements. Bonus expiry 30 days. Bonus spins expiry 2 days. Game restrictions apply  Further Terms Apply #ad

Race Casino
  • 100% up to £100
  • 10% Cashback
  • 1500+ Slots
T&C Apply

New customers only. Min deposit £10. Wagering 40x bonus. Max bet £5 with bonus funds. 100% up to £100. Eligibility is restricted for suspected abuse. No max cash out on deposit offers. Welcome bonus excluded for players depositing with Skrill or Neteller. Full T&Cs apply #ad

LeoVegas Casino
  • 50 Wager-Free Spins
  • £100 in Bonuses
  • 2,650+ Slots
T&C Apply

New players only. No deposit needed. 3 days to claim & 3 day expiry. 10x free spins worth 10p on Book of Dead. Opt in & deposit £10, £25 or £50 within 7 days & further 7 days to wager cash stakes 35x to unlock reward (£50 on 2 deposits). 3 day exp. Wagering/game contributions vary. 25 wager-Free Spins x10p to added to Starburst with each qualifying deposit, 3 day expiry. 18+ #ad

Book of Spies: Mission X Slot RTP, Details and Wager Limits

The Book of Spies: Mission X slot starts with 5 reels, 4 rows and 1,024 ways to win. Wins are award when 3, 4 or 5 matching symbols appear on adjacent reels in any position, beginning from reel 1.

You can spin away from 20p to £100 per spin. Click on the coins icon below the spin button to simple choose your appropriate stake. Above the spin button there’s an Autoplay function where you can choose 5 to 100 autospins. There’s also an infinity option. You can stop autoplay if you balance increases or decreases, on a single win limit of your choice or when triggering the free spins.

The Book of Spies: Mission X RTP is 96.1% which is average. Very highly volatile, most of the bigger wins will come from the free spins. The max payout is an impressive 27,000 x your total stake per spin.

Theme – Audio and Design Features – join heroin Lara Jones


The Book of Spies: Mission X slot has a spy theme. It’s based on the intrepid and beautiful heroin Lara Jones. She leads a team of secret agents on an impossible mission to hack the digital vaults of an evil spy master to steal the ‘Book of Spies’.

Visually, the game is well designed and comes with high definition graphics. The Lara Jones character is clearly inspired by the infamous Lara Croft character. Set on dark reels, the soundtrack is upbeat and reminiscent of the Mission Impossible films.

On the reels you will see low value neon A, K, Q, J, 10 and 9 symbols. The high paying symbols include members of Lara Jones’ team. You have Extreme Hack Henry, Big Tech Terry, One Shot Suzie and Evil Spy Master. The Evil Spy Master is the most valuable symbol giving you 1, 2.5 or 15 x stake for 3, 4 or 5 in combination. He looks like the Le Chiffre character from James Bond’s Casino Royale film.

Book of Spies: Mission X can be played on desktop, mobile and tablet devices. The superb graphics and animations work well on smartphones.

Bonus Features in Book of Spies: Mission X

The Book of Spies: Mission X slot focuses on the xNudge Tombstone Wilds feature which is central to most of the action. With increasing multipliers, there are 2 free spins features with 1 of them giving you sticky tombstone wilds.

xWays Mystery Symbol feature

There’s an xWays logo which is the mystery symbol. It can contain 2 to 4 of the same symbol inside which will expand the reel up to 7 symbols high. This will increase the number of ways to win essentially.

In the base game, the xWays mystery symbol can appear on the odd-numbered reels (i.e. 1, 3 and 5). This means you can benefit from 5 symbols on reels 2 and 4 with 7 symbols on reels 1, 3 and 5. This can lead to 5,488 ways to win on every base game spin (7x4x7x4x7 = 5,488).

xNudge Multiplier Wilds feature

Look out for the Lara Jones wild symbol. Appearing on reels 2 and 4, the wild always nudges upwards to replace all symbols above it.

Known as the xNudge Multiplier Wilds feature, each nudge increases the wild multiplier by 1 up to a maximum of 4x. If it’s combined with an xWays Mystery symbol above it, the multiplier can reach a maximum of 7x. However, 2 wild multipliers landing simultaneously will see the wild multiplier values multiplied together up to 8x in the base game.

Secret Agent Free Spins feature


The Secret Agent Free Spins feature is triggered by landing 3 Book of Spies bonus symbols on the reels simultaneously (they can only appear on reels 1, 3 and 5).

The number of free spins you will win is 1 plus the number of nudges required to nudge the symbol the bottom position of the reel. Every nudge gives you an extra free spin. This means you can begin with between 3 and 21 free spins.

Prior to the free spins beginning, 1 of the 4 high value spy symbols becomes the special symbol. Once a free spin has taken place and 3 or more reels contain a special symbol, they will expand to cover the whole reel it’s on. The good new is that expanded special symbols will pay scatter style – i.e. not on adjacent reels.

The xWays Mystery Symbol feature is also in play. With mystery symbols appearing on all 5 reels, every reel can contain 7 symbols each. If you do this, you will play with 16,807 ways to win (7x7x7x7x7 = 16,807).

Wild symbols can also land and trigger the xNudge Multiplier Wilds feature. However, the maximum possible multiplier can reach 14x (as opposed to 8x in the base game). Furthermore, you can retrigger the feature to give you up to 42 free spins in total. The original special symbol will be used for the extra free spins.

Finally, you can buy your way into the free spins for 70 x your total stake. Giving you 10 free spins, this option isn’t available to UK players.

Book of Spies: Mission X Review Summary – excellent first franchise

Spearhead Studios and Nolimit City have combined to deliver an excellent franchise of the xWays and xNudge mechanics. The Book of Spies: Mission X slot is well designed and has all the bells and whistles we’ve become accustomed to from Nolimit City slots.

Saying that, it’s easy to follow and can give you a huge number of ways to win in the free spins. The key to winning big is from the multipliers which can combine up to 14x. The Secret Agent Free Spins feature combines increasing ways to win and multipliers with the same mechanic from the classic Book of Ra Deluxe slot (by Novomatic).

‘Book of’ slots are very common these days but Spearhead Studios has managed to add a fresh twist to the popular concept and with much bigger wins than the likes of Book of Dead. Overall, a superb game that will appeal to many players.

Book of Spies: Mission X FAQs

What is the Book of Spies: Mission X RTP?

The Book of Spies: Mission X return to player rate is 96.1%. The game is highly volatile though with wins landing pretty regularly.

What is the Book of Spies: Mission X max win?

The most you can win from a single spin is 27,000 x your total stake. The big wins will come in the free spins where wild multipliers can reach 14x and the number of ways to win can reach 16,807.

Are there any Book of Spies: Mission X free spins?

Yes, the Secret Agent Free Spins feature gives you up to 42 free spins with a special expanding symbol. With x Ways and xNudge mechanics in play, you could benefit from 16,807 ways to win and multipliers up to 14x.

How does the xWays Mystery Symbol feature work?

The xWays logo mystery symbol can reveal up to 4 of the same symbol. This causes the reels to expand. Known as the xWays Mystery Symbol feature, this can lead to 5,488 ways to win in the base game and 16,807 in the free spins.

Book of Spies: Mission X Slot Information

  • Game:
    Book of Spies: Mission X
  • Provider:
  • Type:
    Video Slot
  • Reels :
  • Paylines:
  • Stakes Range:
    20p to £100
  • Bonus Features:
    Yes (3)
  • Free Spins/Multiplier:
  • RTP %:
  • Max Win:
    27,000 x
Review by Chris Taylor

Review by Chris Taylor

Chris is a slots expert that has reviewed and played over 4,000 online slots. Having being in the iGaming industry for over 16 years, he knows how slots work, how bonus features are triggered and how the RTP and variance affect the gameplay.