Book of Oz Lock N Spin Slot Review
A tall stained-glass window glows teal and green above the reels, gold-trimmed, flanked by ornate stone pillars, with a warm doorway burning low at the bottom of the scene. Book of Oz Lock N Spin is the rare Book slot that trusts you with the maths: after nearly every spin it will quote you a price, reel by reel, and let you decide whether the near-miss on screen is worth finishing. Most games in this family treat you as a spectator between bonuses. This one puts you to work.
Triple Edge Studios build this one on a 5×3 grid with 10 fixed paylines, at 96.35% RTP (96.60% with respins), very high volatility and a 5,000x win ceiling. Bets run from 0.10 to 50.00 per spin. It sits alongside Book Of Oz, Legacy of Oz and Book of Oz Magic 5 POWER COMBO in the studio’s Oz catalogue.
The Base Game
Wins land the traditional way here: matching symbols on adjacent reels, left to right, across 10 fixed paylines. Where multiple combinations land on one line, only the highest pays. The total payout is the sum of all payline wins plus any Scatter wins.
The Book symbol does double duty as both wild and scatter. It substitutes for every other symbol, pays in any position, and forms its own winning combinations anywhere on the reels, with only the highest win paid per combination. Scatter wins are multiplied by the total bet.
The bet multiplier is 10, matching the payline count, and payouts are based on the initial bet placed per line. It’s a clean, old-school Book setup – no gimmicks in the symbol layer, everything unusual about this game lives at reel level.
Autoplay is here too, with a set number of spins played at the current bet. Triggering the free spins feature stops it mid-session, and you can attach a win limit or a loss limit that ends the run early. It’s a base game convenience, nothing more.
Lock ‘N Spin and the Respin Feature
This is the game’s signature move, and it’s where Lock N Spin gets its name. At the end of any base game spin you can lock up to 4 reels, then pay to respin the unlocked ones. Each unlocked reel displays its own cost, which becomes your new total bet for that respin.
Locking is as simple as selecting the reel or the lock icon, and a key icon unlocks again. Changing your bet disables the feature until your next spin. The full rule set looks like this:
- Any reel can be respun, multiple times, at an additional cost
- Only new winning combinations formed by the respin are paid
- The cost per respin doesn’t indicate a better or worse chance of winning
- Respin cost scales with your bet
- A bet change disables the feature until you spin again
- The feature is available in the base game only, and never on the first spin after a feature completes
- It may not be available in every version of the game
The maths behind it is more transparent than most. Respin costs are calculated per reel as the average payout for that reel divided by a target respin RTP, rounded up to the nearest cent. That rounding can lower the expected return.
Any respin costing .01 carries a 0% RTP – it exists purely to arrange symbols for future combinations, not to win on its own. The edge sits with the house either way.
It’s a mechanic that rewards players who can read a grid. Lock 3 reels of a promising line, respin the other two, and the game prices that decision for you every time. The 96.60% respin RTP tells you the pricing is fair, if barely.
Free Spins and Expanding Symbols
The scatter side of the Book triggers the main event. Land Scatters anywhere on the reels and the round pays out like this:
- 3 Scatters – 10 free spins
- 4 Scatters – 12 free spins
- 5 Scatters – 25 free spins
All lines and bets stay the same as the triggering spin. The same combinations retrigger the same numbers of spins mid-round.
Expanding Symbols
A special symbol is randomly awarded when the round starts. Special symbols expand to cover their entire reel and pay when matching symbols land anywhere on a line, not just adjacent positions. They only expand when the expansion will complete a win, and expansion wins pay on top of regular free spin wins.
The Scatter itself can’t become a special symbol. Every retrigger adds another special symbol to your collection, and all of them are tracked in a banner above the reels – so a long round can end with several expanding symbols working at once. That’s where the 5,000x ceiling becomes a live possibility rather than a number on a spec sheet.
The 2nd Chance Feature
Triggering free spins brings one extra decision with it. Before the round begins, you’re offered a single option: keep the expanding symbol you’ve been awarded, or discard it and take a different randomly selected one.
Keep runs with the symbol shown; Try Again rerolls it and starts the spins either way. It’s a small touch, but it’s a genuine choice at a moment most Book slots leave entirely to luck.
Our Honest Verdict
Overall Rating: 7.7/10
This is a Book slot that never leaves you alone. Under that glowing green window, almost every spin ends with a question: two of a kind staring at you, a price under each unlocked reel, and nobody else to blame for the answer. That constant involvement is the whole reason to pick it over its plainer cousins – the free spins round itself is a rerun of a formula every Book player already knows.
The pricing is the strength. Quoting a live cost per reel keeps every respin an informed decision rather than a hopeful stab, and the 96.60% respin return means the game isn’t quietly skimming on top. The weakness is the burn rate: very high volatility with paid respins on top means a cold session drains fast, and the mechanic that makes the game interesting is the same one that empties the balance.
It suits players who enjoy the decisions as much as the wins, and who can walk away from a priced respin. Anyone after a sit-back-and-spin evening has kinder options in the same Oz catalogue – the green light in this hall is on for the ones who like doing the sums.
Book of Oz Lock N Spin FAQs
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What is the RTP of Book of Oz Lock N Spin?
The RTP is 96.35%. If you use the respin feature, the return rises slightly to 96.60%. -
Is Book of Oz Lock N Spin high volatility?
Yes, the game is rated very high volatility, so wins tend to be less frequent but with bigger potential payouts when they land. -
How do you trigger free spins in Book of Oz Lock N Spin?
Scatter symbols anywhere on the reels start the round: 3 Scatters award 10 free spins, 4 award 12, and 5 award 25. The same combinations retrigger the round mid-spin sequence. -
How does the Lock N Spin feature work?
Once a base game spin has finished, select the reels you want to hold – up to 4 of them – and the remaining ones respin at a per-reel cost shown on screen. Only wins formed by the respun reels are paid. -
What does the 2nd Chance Feature do?
When you trigger free spins, you get a one-time option to keep the randomly awarded expanding symbol or discard it for a different one. Either choice then proceeds to the free spins round. -
What is the maximum win on Book of Oz Lock N Spin?
The maximum win is 5,000x your bet. -
What is the hit frequency of Book of Oz Lock N Spin?
The hit frequency is 31.02%, meaning roughly three in ten spins produce a winning combination. -
Who makes Book of Oz Lock N Spin?
The game is made by Triple Edge Studios. It runs on a 5×3 grid with 10 fixed paylines and bets from 0.10 to 50.00 per spin.
