Book of Books

|Peter & Sons|2023-03-16|RTP: 96.10 %
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Game provider
Peter & Sons
Book of Books
Feature Buy
Game type
Video Slots
Mobile version
Grid slot
Sticky wilds
Free spins
Bonus game
Progressive jackpot
Min. bet
Random Feature
Max. bet
Maximum win
Last update
February 28, 2023


2 votes - 4.50/5.00

Join the secretive Order of the Penguin on the video slot from Peter & Sons, in an ultimate quest for powerful ‘Book’ gaming. Book of Books plays a 5×3 reel set with 10 pay lines, wild substitutions and a Power Up collection to build free spins, special expanding symbols and multipliers for bonus games. Craft expanding reel sets of 4×4 and 5×5 with a maximum of 40 pay lines, up to 10 special expanding symbols on every spin, and expanding symbol win multipliers for legendary bonus games with treasures of up to 10,000x your stake.

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Slot Details

Book of Books is a video slot with 5 reels, 3 rows and 10 pay lines. During free spins, the layout can increase to 4×4 and 5×5 sizes with 20 and 40 pay lines accordingly. Wins are awarded for matching two or more consecutive symbols from the leftmost reel along lines. Whisper your way into the Order of the Penguin from 0.10 to 50 credits per spin. This game has a high volatility rating and a 96.10% RTP. Alternative RTP versions may exist. Open the game info upon loading to determine the model in play.

In typical, jovial, Peter & Sons fashion, there is a mysterious story behind the animated characters of this title. The Order of the Penguin disguises as musicians and minstrels to protect the most powerful book known to man, the all-mighty Book of Books. Beneath swaying trees reminiscent of the studio’s setting for Robin: Sherwood Marauders, our band plucks bard music to pleasing animations in pen-and-ink style.

Book of Books Slot Screenshot
Book of Books Slot – Base Game

The pay symbols start at the low end with coloured card suits of green clubs, blue diamonds, purple spades and red hearts, awarding 5x or 8x your bet for five on a pay line. Three shield symbols follow, bearing crests of a blue axe, purple hammer and red sword, awarding 10x or 20x your bet for five-of-a-kind. Three character symbols complete the lineup, showing the band members in royal and military attire, and matching five across the reels pays from 50x to 150x your stake.

A golden W represents the wild symbol that substitutes all others except for the gold book scatter symbol, which awards upgrades for landing two on a spin for the free spins bonus, which is triggered by landing three or more.

Book of Books Slot Features

It’s always a pleasure reviewing a Peter & Sons slot. Fresh and artistic, the animation and themes are deliciously intriguing, and the young studio dares to brave innovation in game design; two impressive reasons to keep tabs on each Peter & Sons release.

Before taking your first spin on Book of Books, you can choose to enable the Golden Bet feature. For a 50% stake size increase, your chances of triggering free spins are increased. Once enabled, Golden Bet is activated and applies to all following spins. Deactivate Golden Bet to return to the regular game.

Book of Books Slot Screenshot
Book of Books Slot – Free Spins & 4×4 Expanded Reels

Wins are connected by matching two or more symbols in succession, along pay lines, starting from the leftmost reel. Wild symbols substitute for all others and will assist in forming win combos. Above the reels, a multiplier value and number straddle the game title, representing the number of free spins and Expanding Multiplier that will be triggered by landing three or more scatters on a spin.

Landing two scatters will award Power-Ups, increasing the starting values of the free spins bonus, at random, as follows:

  • Extra Spins Power-Up: Adds one or two extra free spins to your current total.
  • Extra Expanding Symbol Power-Up: Adds an additional Expanding Symbol to your starting total.
  • Multiplier Power-Up: Increases the Expanding Symbol Win Multiplier by an x1 or x2 increment.

Land three or more bonus scatters on a spin to trigger the Book of Books Free Spins. Three scatters award the regular format of 5×3 with 10 pay lines, four award a 5×4 reel set with 20 pay lines, and five scatters will trigger a 5×5 layout with 40 pay lines. The number of free spins awarded is determined by the value in the meter upon triggering the bonus, along with any Expanding Win Multiplier and extra Expanding Symbols gained. A standard trigger without any Power Ups awards 7 free spins with an x1 multiplier and two Expanding Symbols.

Beneath the reels, each pay symbol is represented on a stone block. On each spin, rising stone blocks represent the Special Expanding Symbols chosen at random from the pay table, according to the number allocated for the round. Standard pay line wins are calculated before all examples of the Special Expanding Symbols expand to fill the reel and award wins according to the number of expansions across all pay lines. For example, three symbol expansions will pay three-of-a-kind across all pay lines – ten, twenty or forty pay lines according to the layout.

Hit two, three, four or five scatters on a free spin to win extra spins and Power Ups for the remaining spins as follows:

  • Two Scatters: One extra free spin plus one random Power-Up.
  • Three Scatters: Three extra free spins plus one random Power-Up.
  • Four Scatters: Five extra free spins plus one random Power-Up and an upgraded layout to 4×5 with 20 pay lines for the remaining spins.
  • Five Scatters: Seven extra free spins plus one random Power-Up and an upgraded layout to 5×5 with 40 pay lines for the remaining spins.

Furthermore, any Expanding Win Multiplier gained is applied to Expanding Symbol wins during the round. The bonus game ends when spins expire, returning you to the base game. The round modifiers reset to seven free spins with two expanding symbols and an x1 multiplier as the default values.

Book of Books Slot Screenshot
Book of Books Slot – Free Spins & 5×5 Expanded Reels

Where available, you can buy into the Free Spins round by using the Bonus Buy feature. For a fixed increase in stake size, you can trigger one of the following bonus games. The number of free spins, Special Expanding Symbols, and value of the Expanding Symbol Win Multiplier is randomly determined upon entering the round:

  • Three Scatter Trigger | 120x Bet: A bonus-triggering spin with three scatter symbols guaranteed.
  • Four Scatter Trigger | 250x Bet: A bonus-triggering spin with four scatter symbols guaranteed.
  • Five Scatter Trigger | 500x Bet: A bonus-triggering spin with five scatter symbols guaranteed.

Final Verdict

The Order of the Penguin lay a bold claim to the Book of Books being all-powerful, which, as crazy as that sounds, may hold some methodic truth behind the madness. While some may prefer more base game features, Book of Books’ appeal lies in building the starting values of bonus games with Power-Ups. The number of spins, amount of expanding symbols and expanding win multiplier can have a significant effect to a varying degree on bonus game outcomes and potential.

During limited demo play, our tantalising collection of Power-Ups blessed a round of nine free spins with eight expanding symbols and an x2 expanding symbol multiplier, which paid in excess of 700x stake. Adversely, a fast trigger will offer lower values, and edge-of-your-seat triggers will come with four or five scatters for extra pay lines. Book of Books is an innovative delight from Peter & Sons, a must for book fans and those with an eye for quality.

GMBLRS limited demo play should never be used as a benchmark for real money play due to the fraction of spins carried out compared to the number required for accurate testing.


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