Welcome back to the world of the intrepid wizard on the slot from Triple Edge Studios powered by Microgaming. Book of Oz Lock ‘N Spin is the sequel to the 2018 original, reversing the initial Respin feature where you could respin any reel to land a missing symbol or scatter. Instead, you can now to lock up to four reels in place for another chance to hit them on the respin. The free spin feature has also a new twist, giving you a second chance if you are not happy with the selected expanding symbol.
Book of Oz Lock ‘N Spin is a video slot with five reels, three rows and 10 fixed pay lines. Wins are awarded for two to five matching symbols on a line from left to right only. Enter the world of the wizard on desktop, tablet or mobile from 0.10 to 25 credits per spin. The game as high volatility with a default RTP of 96.36%. Using the Lock ‘N Spin feature will increase it to 96.60%.
Set in the entrance hall of a fantasy mansion with predominantly emerald colours, the game window impresses with crisp graphics and smooth animations. At the bottom of each reel is a display, that will indicate the cost of locking that individual reel on the current spin. A rather generic but suspenseful soundtrack is only interrupted by the usual reel and win count noises.
The pay symbol set is unchanged, starting at the low end are the card royals from10 through to A, awarding 10x to 15x your bet for a single five of kind. They are followed by three potion bottles in red, purple and blue colours, each with a distinct closure cap – hearts, keys and a lion. The top paying symbol is the male wizard. Hit five on a line to win 75x to 500x your stake. The ominous book has a dual function as the wild and scatter symbol.
In a complete reversal from the original Book of Oz slot, you can now lock any reel instead of respinning it on any spin in the base game. Using the Lock ‘N Spin feature, you can lock up to four reels on each occasion. The five displays at the bottom of the game window will light up after the reels have stopped to show an extra bet amount for each reel. The amount is based on which symbol is missing and what kind of win could happen should the missing symbol appear on the respins. The higher the win potential when the symbol lands, the higher the bet amount for locking the respective reels. The mechanic also works for scatters when only two appear on a spin.
Hit minimum three, four or five scatters anywhere on the reels in one spin to trigger 10, 12 or 25 free spins respectively, which can be re-triggered indefinitely. Additionally, a coin win of 2x, 20, and 200x is awarded for three, four and five scatters. Before the bonus round starts, one of the nine regular pay symbols is randomly selected as the special symbol. When sufficient land on a free spin, they will expand vertically to cover the entire reel and award wins for all pay lines, which are paid on top of any potential organic wins from the spin. It will need minimum three low-paying symbols or minimum two premium symbols anywhere on the screen to see them expand and award a win.
However, there is one twist which comes into after the first random special symbol selection. If you are not happy or do not like the selected symbol, you can use the 2nd Chance to have a different symbol chosen. Worth noting is that you can equally end up with a higher or lower value symbol.
The original Book of Oz game offered already solid “Book” slot action with high volatility and equally high win potential of up to 5,000 times bet. Turning the Respin feature on its head with the Lock ‘N Spin is an interesting twist while the 2nd Chance offers more variety for the expanding symbol. Overall, an improvement over the original and a decent game from Microgaming that deserves a few spins in any slotting session.