Book of Oz is a high-volatility slot from Triple Edge Studios, released in December 2018 and distributed through the Microgaming platform. Set across 5 reels with 10 fixed paylines and a 96.31% RTP, the game draws on L. Frank Baum's classic Oz universe but leans into a darker, more mystical aesthetic. With expanding symbols during free spins and a maximum win of 5,000x your stake, it sits comfortably alongside other popular "book" slots while carving out its own identity through theme and presentation.
Theme and Visual Design
Rather than following the bright, cheerful look of the 1939 film, Book of Oz takes a grittier, more atmospheric approach to the source material. The reels sit against a moody backdrop of the Wizard's chamber, all deep purples, golds and flickering candlelight. The overall feel is closer to a gothic fantasy than a family adventure, which gives it a distinctive edge within the crowded "book" slot category.
Premium symbols include the Wizard himself (the highest-paying icon at up to 5,000x your line bet), alongside three potion bottles representing the classic Oz gifts: courage, heart and brains. These pay between 750x and 2,000x at their best. The lower-value positions are filled by standard playing card symbols from 10 through to Ace, styled to match the game's ornate, magical theme.
How the Free Spins Work
The golden book symbol acts as both wild and scatter, which is the defining mechanic of the "book" slot genre. Landing three or more anywhere on the reels triggers the free spins round. Three books award 10 free spins, four books give 12 and five books unlock the full 25 spins. These can also be retriggered during the bonus if additional scatters land.
At the start of the free spins round, one symbol is randomly selected as the special expanding symbol. Whenever that chosen symbol appears on a reel during free spins, it expands to fill every position on that reel before payouts are calculated. If the Wizard is selected as the expanding symbol, the results can be dramatic, as full reels of the top-paying icon create multiple winning combinations across the 10 paylines simultaneously. This is where the 5,000x maximum win potential lives.
The expanding mechanic means that even lower-paying symbols can produce significant returns when they cover multiple reels at once. Because the special symbol is chosen randomly, each free spins session plays out differently, and there is always the anticipation of whether a high-value or low-value symbol will be picked.
Base Game and Paytable
In the base game, Book of Oz plays on a standard 5x3 grid with wins forming left to right across 10 fixed paylines. Bets range from £0.10 to £25.00 per spin. The golden book wild substitutes for all other symbols to help complete winning combinations, and it also pays independently as a scatter with values from 2x to 200x your total stake.
The paytable is straightforward. The Wizard pays 10x for three of a kind, 100x for four and 5,000x for a full line of five. The courage potion returns up to 2,000x, while the heart and brain potions each reach 750x at five of a kind. Card symbols range from 5x up to 150x at their maximum. With high volatility, extended dry spells between wins are normal, but the payouts that do land tend to be more substantial.
How Book of Oz Compares to Other Book Slots
The "book" slot format was popularised by Book of Dead and has since spawned dozens of variations. All share the same core structure: a book symbol that serves as both wild and scatter, plus expanding symbols during free spins. What sets Book of Oz apart is primarily its theme and presentation. Where Book of Dead draws on Egyptian mythology and Book of the Fallen takes an Aztec approach, Book of Oz goes for a fantasy setting that feels genuinely different from the pack.
Mechanically, the games are similar. The 10-payline, high-volatility structure with a random expanding symbol during free spins is consistent across the genre. Book of Oz offers a competitive 96.31% RTP and the same 5,000x maximum win ceiling as many of its peers. For players who enjoy the book slot format but want something beyond the usual ancient civilisation themes, the Oz setting provides a refreshing alternative.
Who Is Book of Oz Best Suited For?
This is a slot built for players who enjoy high-volatility gameplay where patience is rewarded with larger, less frequent wins. The 10-payline structure keeps things simple, and the bet range from £0.10 to £25.00 makes it accessible across different bankroll sizes. If you already enjoy book-style slots like Book of King Billy or Book of Dead, the Oz theme offers a change of scenery without changing the underlying mechanics you know.
Triple Edge Studios built Book of Oz as a polished entry in a well-established genre. It does not try to reinvent the format but delivers it with strong visual design and a theme that stands apart from the Egyptian and mythological settings that dominate this category. The expanding symbol free spins remain the main draw, and the 5,000x win cap gives the bonus round genuine weight.
Frequently Asked Questions
Book of Oz has a base game RTP of 96.31%. This sits above the industry average for online slots and reflects the game's high-volatility payout structure.
Land three or more golden book scatter symbols anywhere on the reels. Three books award 10 free spins, four books give 12 free spins and five books unlock 25 free spins. The round can also be retriggered.
At the start of each free spins round, one symbol is randomly chosen as the special expanding symbol. Whenever it appears on a reel during free spins, it expands to fill every position on that reel before wins are calculated.
The maximum win in Book of Oz is 5,000x your total stake. This is achievable during the free spins round, particularly when the Wizard symbol is selected as the expanding symbol.
Book of Oz was developed by Triple Edge Studios, an independent game studio that creates slots distributed through the Microgaming (now Games Global) platform. It was released in December 2018.
Yes, Book of Oz is a high-volatility slot. This means wins are less frequent but tend to be larger when they land, particularly during the free spins bonus round with expanding symbols.