Book Of Oz Pros & Cons
Book of Oz nails the nostalgia factor and gives you familiar mechanics with a fresh coat of paint. But that 2,500x max win feels weak compared to modern slots.
- 96.04% RTP beats many Microgaming titles
- Wild multipliers up to 10x in base game
- Free spins retrigger infinitely
- Expanding symbols work on all icon types
- Stacked symbols on every reel boost hit rate
- 2,500x max win is low for medium-high volatility
- Can't buy the bonus feature
- 10 paylines feels limited in 2025
- Long dry spells between bonus triggers
- Theme might not appeal to non-Oz fans
Book of Oz Slot Review: Expanding Symbols Meet Emerald City Magic
Book of Oz takes Microgaming's classic "Book of" formula and drops it into the Wizard of Oz universe. Triple Edge Studios released this one in 2019, and it's got that familiar expanding symbol mechanic you've seen in Book of Dead or Book of Ra. The leading hook here is the free spins round, where one symbol expands to cover the entire reels, plus you get wild multipliers in the base game.
Here at SlotsGamblers, we tested Book of Oz and found it's a solid middle-ground slot. The 96.04% RTP is decent, volatility sits at medium-high, so you'll deal with some dry spells, and the max win hits 2,500x your stake. Not life-changing money, but enough to make it enjoyable.
The game uses a 5x3 grid with 10 paylines, and wins pay left to right only. You've got stacked symbols on every reel, a wild that multiplies your wins by up to 10x, and free spins that can retrigger. The Emerald City backdrop looks good, animations are smooth, and the whole thing runs fine on mobile.
This isn't trying to reinvent slots. It's taking a proven formula and giving it a recognizable theme. If you liked other "Book of" slots but want something with better graphics and a nostalgic Oz vibe, this delivers. High-rollers chasing massive progressive jackpots should look elsewhere, though. The 2,500x cap means your biggest win on a €1 bet is €2,500, so plan accordingly.
The expanding symbol feature keeps things interesting during free spins, and those wild multipliers in the base game can surprise you. But the medium-high volatility means your bankroll needs to last through rough patches. We'll break down everything you need to know below.
| Specification | Details |
|---|---|
| Developer | Microgaming / Triple Edge Studios |
| Release Date | August 2019 |
| Reels X Rows | 5x3 |
| Paylines | 10 (fixed) |
| RTP | 96.04% |
| Volatility | Medium-High |
| Min Bet | €0.10 |
| Max Bet | €50.00 |
| Max Win | 2,500x stake |
| Hit Frequency | ~25% (estimated) |
| Default Bet Range | €0.10 - €50.00 |
| Mobile Compatible | Yes (iOS/Android) |
Symbols & Payouts
10 symbols total - 5 premium character/item symbols and 5 low-value card symbols. The book wild only lands on reels 2, 3, and 4.
📕 Book of Oz Wild - Special
The book symbol is your wild and only appears on the middle three reels. It substitutes for all symbols and offers random multipliers ranging from 2x to 10x. Five wilds aren't possible since it can't land on reels 1 and 5, but when you do get one or two in a winning combo, that multiplier can seriously boost your payout. The book glows with green magical energy when it hits.
👧 Dorothy Symbol - High Value
Dorothy is the top-paying regular symbol in the Book of Oz. She's drawn in a classic blue gingham dress, Toto in her arms. Five Dorothys on a payline pay 200x your line bet, making this your best shot at big wins outside the bonus round. The symbol has nice detail and animates when part of a win. You'll want to see these stacked.
🦁 Cowardly Lion - High Value
The lion pays 100x your line bet for five of a kind. He's designed with that goofy, lovable expression from the movie. This symbol appears frequently because it's set to a high frequency. During free spins, if the lion gets chosen as your expanding symbol, you're in for some solid payouts.
🤖 Tin Man - High Value
Tin Man pays 80x for five matches. The symbol shows him holding his axe, with that silver sheen. He's a medium-frequency symbol, so you'll see him regularly but not constantly. When he expands during free spins, he can cover a lot of the screen since he appears stacked in the base game.
🌾 Scarecrow - High Value
The scarecrow symbol pays 60x your line bet for five-of-a-kind. He's designed with straw sticking out and that classic floppy pose. This is another mid-value icon that shows up often enough to keep your balance steady. The animation when he's part of a win is subtle but smooth.
💎 Emerald Symbol - Medium Value
The green emerald pays 40x for five matches. It's a simple gem design with sparkle effects. This symbol bridges the gap between premium and low-value icons. You'll land these frequently, and they help fill out smaller wins when the character symbols aren't cooperating.
🃏 Ace (A) - Low Value
Standard playing card symbol in green with a subtle glow effect. Five aces pay 20x your line bet. These keep popping up and account for most of your small wins. Not exciting, but they keep your balance from draining too fast between bonus rounds.
🃏 King (K) - Low Value
Purple-colored king symbol that pays 15x for a five-of-a-kind. Another frequent-hitter that fills the reels between premium symbols. The card symbols look decent enough—not lazy, just standard slot fare.
🃏 Queen (Q) - Low Value
The Blue Queen symbol pays 15x for five matches. Same deal as the king - shows up all the time, keeps you afloat with small wins while you wait for character symbols or the bonus trigger.
🃏 Jack (J) - Low Value
The orange jack symbol pays 10x your line bet for five-of-a-kind. This is your lowest-paying icon, but you'll see it constantly. During free spins, if the jack gets selected as your expanding symbol, you're in for a disappointing round.
| Symbol | 5 of a Kind | 4 of a Kind | 3 of a Kind | 2 of a Kind | Special Properties |
|---|---|---|---|---|---|
|
Dorothy
|
200x | 50x | 20x | - | Stacked |
|
Lion
|
100x | 30x | 10x | - | Stacked |
|
Tin Man
|
80x | 25x | 8x | - | Stacked |
|
Scarecrow
|
60x | 20x | 6x | - | Stacked |
|
Emerald
|
40x | 15x | 5x | - | Stacked |
|
Ace (A)
|
20x | 10x | 4x | - | Frequent |
|
King (K)
|
15x | 8x | 3x | - | Frequent |
|
Queen (Q)
|
15x | 8x | 3x | - | Frequent |
|
Jack (J)
|
10x | 5x | 2x | - | Frequent |
|
Book Wild
|
- | - | - | - | 2x-10x multiplier |
Bonus Features
One main feature here - the free spins round with expanding symbols. Simple but effective when it hits.
| Feature | Trigger Method | Description | Max Potential | Frequency | Re-trigger |
|---|---|---|---|---|---|
|
Free Spins
|
3+ book scatters reels 1, 3, 5 | 10 free spins on with 1 expanding symbol | 2,500x stake | Medium (1 in 150-200 spins) | Yes (infinite) |
|
Wild Multipliers
|
Book wild lands reels 2, 3, 4 | Multiplies onwins by 2x-10x randomly | Varies | Common (every 10-20 spins) | N/A |
|
Expanding Symbol
|
Chosen at start of free spins | One symbol expands to cover entire reel | Part of 2,500x max | N/A | N/A |
RTP & Volatility
96.04% RTP is standard for Microgaming slots. Medium-high volatility means patience is required.
| Metric | Details |
|---|---|
|
Min Bet
|
€0.10 |
|
Max Bet
|
€50.00 |
|
Max Win
|
€125,000 (2,500x at max bet) |
|
RTP
|
96.04% |
|
Volatility
|
Medium-High |
Mobile
Works perfectly on mobile: no lag, no crashes, no weird button placements. We tested on iPhone and Android, and everything runs smooth.
The game auto-adjusts to your screen size and keeps all buttons accessible. Spin button sits in the right spot, bet controls are easy to tap, and the paytable is readable even on smaller screens. Battery drain is standard—nothing excessive.
Tips from SlotsGamblers
Start with minimum bets to see how the game plays before committing bigger money. Medium-high volatility can quickly drain your balance.
Expect 150-200 spins between bonus triggers on average. In some sessions, you'll hit it in 50 spins; in others, you'll wait 300. Budget accordingly.
Wild multipliers are random, so don't chase them. When they hit 8x-10x, it feels great, but most of the time you'll get 2x-3x.
If you trigger free spins and get a card symbol as your expander, don't expect miracles. Dorothy, the lion, or the tin man are what you want. Jack or queen expanding symbols usually pay under 50x total for the whole bonus.
The infinite retrigger potential sounds great, but rarely delivers. Most bonus rounds give you 10-20 total spins. Getting 50+ spins with retriggers happens 1% of the time.
Similar Games
Book of Dead (Play'n GO)
The OG expanding symbol slot with higher volatility and a 5,000x max win. Better for risk-takers.
Legacy of Dead (Play'n GO)
Updated version of Book of Dead with more features and better graphics. Similar vibe to Book of Oz.
Book of Ra Deluxe (Novomatic)
The classic that started the whole "Book of" craze. Lower RTP but nostalgic for older players.
Rich Wilde and the Tome of Madness (Play'n GO)
Different mechanics but same adventure/book theme. More volatile with the portal feature.
Play Responsibly - 18+ Only
Gambling should be entertaining and fun. Remember that slots are games of chance, and there's no guaranteed way to win. Never gamble more than you can afford to lose, and always set limits for yourself. If you feel gambling is becoming a problem, please seek help immediately.
FAQ - Frequently Asked Questions
How often does the free spins bonus trigger in Book of Oz?
Usually every 150-200 spins based on our testing. Sometimes you'll hit it in 50 spins, other times you'll wait 300+. Medium-high volatility means patience is required.
Can you influence which symbol becomes the expanding symbol during free spins?
Nah, it's completely random. The game picks one symbol after you trigger the bonus, and you're stuck with it. Getting Dorothy or Lion is great; getting Jack or Queen sucks.
Why do the book wilds only appear on reels 2, 3, and 4?
Microgaming did this to keep the multipliers balanced. If wilds showed up everywhere with 10x multipliers, the RTP would spike too high, and they'd have to drop it elsewhere.
What's the maximum multiplier you can get from stacked wilds?
If you land three wilds with 10x multipliers each, you'd get 1,000x theoretically. But realistically, you'll see 2x-5x multipliers more often. The big 8x-10x multipliers are rare.
How many free spins can you get total with retriggers?
Infinite technically - there's no cap. Here at SlotsGamblers, we've seen players hit 100+ spins with lucky retriggers, but 10-30 total spins is way more common.
Is Book of Oz better than Book of Dead?
Depends on what you want. Book of Oz has better graphics and lower volatility, so your money lasts longer. Book of Dead is more volatile with a 5,000x max win vs 2,500x here. Dead hits harder, Oz is smoother.
Can the expanding symbol land on non-adjacent reels and still pay?
Yeah, that's the cool part. Normal wins need adjacent reels, but the expanding symbol pays scatter-style. Three expanding symbols anywhere on the screen pay out, no adjacency needed.
What's the minimum bankroll recommended for Book of Oz?
Bring at least 100x your bet size. Playing €1 spins? Have €100 ready. The medium-high volatility will burn through smaller bankrolls during cold streaks, and you need enough to survive until the bonus hits.