The “Book of…” slot style has become a huge hit. From its humble roots with the Book of Ra Deluxe slot through to big hits like the Book of Dead slot, the simple mechanic has connected with audiences. For those that don’t know, the “Book of…” games typically consist of some sort of ancient or adventurous theme and use an Expanding Symbol mechanic in the Free Spins Round. Peter & Sons has now taken the concept to the next level, with the Book of Books slot, at least according to its title, setting out to be the ultimate “Book of…” game. Does it succeed, though? Let’s take it for a spin and find out in this Book of Books slot review.

Peter & Sons’ visual style is incredibly unique, and it does a great job of making slots stand out. The game is set in a medieval kingdom, a refreshing change for a “Book of…” game. The reels are encased in black stones on either side, with several animated characters sitting around the grid, playing music and jigging about. It’s a cool design that instantly injects the slot with tons of personality.

The Book of Books slot may look quirky, but the base game is fairly conventional. The slot uses a 5x3 set-up with 10 paylines. However, this can increase during the bonus rounds, with the game able to offer up to 40 lines and five symbols on each row.

All of the other standard features you would expect to find are present and correct. The stake is adjusted under the reels, with a minimum bet of $0.10 and a maximum of $50. This is a good range that is probably going to please those on smaller budgets. The slot also uses an Autospin feature and a Turbo feature, with the availability of the latter depending on your location.

The quirky design of Book of Books has no problem moving onto mobile devices. Peter & Sons has developed the slot using HTML5 technology. This ensures it runs on both desktop and mobile platforms. You can take the game for a spin at a range of top new online casino sites that offer mobile gaming options.

It is in the bonus features that Peter & Sons has really made the Book of Books slot stand out from other “Book of…” games. Firstly, whenever players land two Scatters in the game, they will be rewarded with a random Power Up feature. This Power Up can be one or two extra spins, an Expanding Multiplier, or an additional Expanding Symbol.

The main bonus feature in the slot is the Free Spins Round. Three or more Scatters launch this. Players get given seven spins. If they launch it with three Scatters, the grid stays as normal; if four launch it, then the grid expands to 5x4 with 20 paylines; and if five launch it, then the grid becomes 5x5 with 40 paylines. The grid will reset at the end of the Free Spins Round.

During the round, any Power Up features that have been collected will be triggered. There is also the obligatory Expanding Symbol feature, but Peter & Sons has put a twist on it. The selected symbol changes on each spin and is displayed on the side of the reels. If the symbol can expand to create a win, then it will do so. You can retrigger the spins by landing two Scatters. Landing more than that will restart the session with additional Powers up active.

The Book of Books slot offers players a maximum payout of 10,000x their stake. This is a good amount and is the kind we’ve become accustomed to seeing in the better “Book of…” real money slot games. The slot also has a generous RTP of 96.10%, putting it above average. It has been given a high volatility rating by Peter & Sons.

Peter & Sons is one of the most underrated developers in the slot industry, and players would be wise not to sleep on a game like Book of Books. The slot takes everything players love about the well-established “Book of…" formula and puts an entirely fresh spin on it. It boasts an impressive design, some good winning potential, and a selection of features that feel both new and familiar. This is a slot well worth digging out at our highlighted online casino slot sites that provide it.