Game ThemeFairytales |
ProviderGames Global |
VolatilityVery high |
RTP96.31% |
Max Multiplier |
Min Bet0.10 CHF |
Max Bet20.00 CHF |
Released on December 12, 2018, Book Of Oz takes place at the heart of an emerald palace bathed in green light and fantastic echoes. The slot features a 5 reels, 3 rows, and 10 paylines structure, faithful to the classic “book slots,” but with a new twist that significantly changes the spin dynamics.
The visual setting is inspired by a fairy-tale world reminiscent of a lavish city, with elegant columns and gilded details. The reels dominate the screen, and the design highlights each symbol with touches of polished glass and metal, in a refined yet readable style. This visual clarity serves a very straightforward mechanic: wins are achieved from left to right by aligning identical symbols on an active line. Premium symbols can even pay from 2 matches, giving a particular rhythm to small and medium combinations.
The “Book” principle is respected and enhanced. The Book acts both as Wild and Scatter, at the core of the feature architecture. It substitutes standard symbols to complete lines and triggers Free Spins (10, 12, or 25) when it appears in sufficient quantity. During these spins, a random expanding symbol is chosen (excluding the Wild) and can cover an entire reel, creating specific “scatter” evaluations across the paylines.
The major difference lies in a rare mechanic for the genre: an option for individual reel Re-spins (paid). After a base spin, each reel can be respun individually at a cost depending on the potential combination visible on the screen. This system — not available in the bonus — acts as a targeted “boost,” interesting to observe in how it paces the grid and brings it closer to triggering free spins or a premium expansion. Additional detail: only wins involving the respun reel are counted; furthermore, changing the bet temporarily disables the Re-spin option until the next spin.
Ultimately, the structure offers a ceiling consistent with its “Book” DNA: a maximum potential of 5,000x, mainly associated with alignments and expansions during Free Spins. In terms of ergonomics, the overall design is optimized for smooth sessions, with a clear interface and careful adaptation to pocket screens. The general impression is a classic formula, polished with modern ideas that add breath to the base game.
The aesthetic mixes a dominant green palette with golden accents. The décor evokes a sumptuous interior with emerald green columns, as if carved from fanciful marble. The reels, framed by a luminous border, fit discreetly into this environment; the whole resembles a throne room, calm and quiet, where each spin makes the light particles hiding in the corners shimmer.
The visual style navigates between classic and modern. Main symbols — flasks and the wizard — feature a “glass and metal” finish, translucent and shiny, reminiscent of refined alchemist’s accessories. The animations, without excessive effects, remain smooth and readable. They highlight key moments (Book appearances, Free Spins triggers, expansions) without overloading the grid, enhancing instant understanding of the mechanics.
This graphic choice has a direct advantage on gameplay readability: the hierarchy of symbols and events is immediately clear. The Book stands out sharply, potions have recognizable silhouettes, and the card symbols remain as visual “anchors.” Everything helps highlight the internal functioning of reels and paylines, without unnecessary distraction.
The icon gallery relies on clear markers, with touches of the Oz universe:
This range of symbols supports logical progression: cards stabilize the pace, potions and the wizard create value peaks, and the Book orchestrates phase transitions (base/bonus). The fact that some premiums pay from 2 symbols subtly changes the perception of “quasi-lines,” which become particularly interesting when reels pause just before an expansion or trigger.
The soundtrack has the polish of a cinematic adventure score. Orchestral layers and harp touches bring a mysterious dimension during the base game, with calm breathing between spins. During key events — Book appearances, Free Spins triggers, symbol expansion — the mix gains intensity, like a crescendo highlighting the increasing stakes on the grid.
The sound effects accompany each spin with subtle mechanical rubs and crystalline chimes when combinations lock. The overall sound design is neither loud nor minimal: it integrates with gameplay, emphasizes session structure, and provides precise auditory cues for transitions (triggers, re-spins, expansions).
After a base game spin, each reel shows a re-spin cost calculated based on the bet and visible configurations. The Re-spin applies to a single reel, and the algorithm adjusts the price according to immediate potential (completing a line, approaching a trigger, etc.). Only combinations involving the re-spun reel are then paid, focusing results on the intervention made. This option is inactive during Free Spins. Another structural note: changing the bet cancels the option until the next spin, avoiding calculation inconsistencies.
Central icon of the grid, the Book alternates two functions. As Wild, it replaces standard symbols to complete lines. As Scatter, it triggers Free Spins whenever it appears in sufficient quantity, regardless of position or lines.
The bonus starts with 10, 12, or 25 Free Spins, depending on the number of Books shown. A notable advantage is the potentially unlimited re-triggers: getting at least 3 Books during the bonus adds a new series of spins. All payouts follow the same logic as the base game, with the added feature of the expansion described below.
Before the first Free Spin, a random symbol (excluding Wild) is designated as expandable. When it can create a new winning combination, it stretches to cover the entire reel. Evaluation becomes “scatter-style” on the line, meaning adjacent symbols are not required to pay. This iconic “book slot” mechanism delivers most of the top wins and works perfectly with the pace of re-triggers.
The math foundation is organized around 5 reels, 3 rows, and 10 fixed lines. Evaluations are left to right, and premium symbols can pay from 2 matches, creating a recognizable win curve: a steady flow on card icons, punctuated by peaks on potions and the wizard — complemented by Book-driven triggers and expansions.
The symbolic cap of 5,000x summarizes the series’ ambition: a ceiling concentrated on the bonus phase when the expandable symbol reaches its full potential. There is no progressive jackpot; session progression relies on expansions, Wild-completed lines, and re-trigger sequences.
Book Of Oz is built around immediately identifiable features: combined Wild/Scatter, Free Spins with a expandable symbol, and especially paid Individual Reel Re-spins in the base game. Everything is based on a 5x3, 10-line matrix that emphasizes Free Spins triggers and the “fireworks” effect of the expansion.
| Element | Details |
|---|---|
| Structure |
|
| Book (Wild & Scatter) |
|
| Free Spins |
|
| Expandable symbol (in Free Spins) |
|
| Paid Reel Re-spins |
|
| Win Cap |
|
| Compatibility |
|
Book Of Oz combines the core codes of the “Book” format — Book in dual role Wild/Scatter, 10/12/25 Free Spins, expandable symbol — and enhances them with a modern touch: targeted individual reel Re-spins. This last mechanic, rare in the genre, acts as a subtle layer of engineering over the base game. It adds rhythm, occasionally opens the door to the bonus, and allows the player to view the grid from a new angle — that of a punctual, variable-cost adjustment. It is uncommon for a “book slot” to give such importance to a selective re-spin on a single reel, which forms the most distinctive identity of this version.
Within the “book slots” universe, the kinship is obvious. The duo Free Spins + expandable symbol has formed the mechanical core for years, with conditional expansions and “scatter-style” line evaluations. Book Of Oz does not seek to distort this formula; it polishes it by adding an interactive preamble in the base game through paid Re-spins. The result reads like a familiar score whose tempo has been slightly accelerated between two choruses.
Thematically, the emerald artistic direction stands out with a refined finish: columns, crystalline flasks, wizard’s hat, golden Book. The contrast between premium symbols (wizard, potions) and card base (10–A) remains clear, and animation supports without overwhelming. The soundtrack, close to adventure music, structures transitions effectively: triggers, expansions, cycle ends.
In comparison, the “Book” DNA naturally links this title to older icons centered on the expandable symbol in Free Spins. Similarities are particularly evident in the way the expansion activates only when it creates a new winning combination, and in the importance of re-trigger sequences that can extend the bonus. The key difference — and what sets Book Of Oz apart — lies in its Re-spins of reels: a rare tool, limited to the base game, inactive during the bonus, and strictly focused on the re-spun reel (only wins involving this reel are counted). This clear separation of roles between base and bonus reinforces overall readability.
For those interested in “Book” model variants, parallel paths can be envisaged. Some titles inherit the same 5x3, 10-line layout with an expandable symbol; others revisit the theme with different protagonists while keeping the Book as Wild/Scatter and re-trigger sequences. There are also direct sequels that take Book Of Oz’s structure and add subtle nuances (locks, refined re-spin adjustments, etc.), while respecting the genre’s conventions.
In summary, Book Of Oz capitalizes on a proven formula by infusing a mechanic that “explodes like fireworks” at the right moment: expandable symbols in Free Spins. The reel Re-spin option adds a specific relief to base game spins. The whole remains clear, technically framed, faithful to the expectations of the “Book” format, with a maximum potential of 5,000x. A recognizable signature, balancing tradition and well-integrated modern adjustments.
| 2 x1 3 x10 | 4 x100 5 x500 | |
|---|---|---|---|
| 2 x0.5 3 x4 | 4 x40 5 x200 | |
| 2 x0.5 3 x3 | 4 x10 5 x75 | |
| 2 x0.5 3 x3 | 4 x10 5 x75 | |
| 3 x0.5 | 4 x4 | 5 x15 |
| 3 x0.5 | 4 x4 | 5 x15 |
| 3 x0.5 | 4 x2.5 | 5 x10 |
| 3 x0.5 | 4 x2.5 | 5 x10 |
| 3 x0.5 | 4 x2.5 | 5 x10 |
How to trigger the Free Spins?
With at least 3 Books (Scatter), the number of spins depends on the quantity. Re-triggers are possible during the bonus with 3+ Books.
What is the role of the Book?
It serves a dual purpose: Wild to substitute standard symbols and Scatter to launch the Free Spins when it appears in sufficient quantity, regardless of position.
How does the Reel Re-spin work?
After a base spin, you can re-spin any reel for a variable cost; only wins involving that reel are counted. Option inactive during Free Spins.
How does the expanding symbol pay during Free Spins?
A symbol (excluding Wild) is chosen before the bonus; if it can form a combination, it expands over its reel and pays “anywhere” on the line, without requiring adjacency.
Is there a progressive jackpot and what is the win potential?
No progressive jackpot; the maximum potential mainly comes from the expansions during Free Spins, in the spirit of “Book” slots.
OL-AGG-20211222-002
