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Book of Oz Lock 'n' Spin

RTP 96.35%
Play Microgaming Slots
Reels 5
Paylines 10
Min bet size 0.10
Max bet size 25
RTP 96.5
Wild symbols Yes
Free spins Yes
Bonus No
Jackpot No

Book of Oz Lock 'n' Spin Slot Review

Released: September 2019

The Book of Oz: Lock ‘n Spin slots game can be found at Microgaming casinos. Microgaming as a standard now publish the slots house edge information of all their games at any online casino that holds a UKGC license (this is a requirement for all UKGC licensed casinos. As such we can say that the House Edge of Book of Oz: Lock ‘n Spin is 3.65%. When playing at any venue that does not hold a UKGC license and does not specifically publish the Return to Player information for their game, this information should be used as a guideline only as we cannot confirm whether or not this game is configurable.

Book of Oz is a 5 reel game that is 3 symbols high. There are 10 paylines in total, playing from left to right.

Special Symbols

The Book of Oz – The “Book of Oz” is the game’s wild symbol, replacing all symbols other symbols. It is also a scatter symbol and it triggers the Free Spins feature.

Bonus Features

Lock ‘n Spin Feature – After each spin you have the chance to lock up to 4 reels in place at a cost that is displayed at the bottom of the reels. You must add to any existing wins in order to win again. Bet changes cancel any locks and the feature is only available in the base game.

Free Spins – To trigger the Free Spins feature you need to reveal 3 or more of the “Book of Oz” symbols on either a single spin, or with the inclusion of re-spins. 3 “Book of Oz” symbols will award you 10 free spins. 4 “Book of Oz” symbols will award you 12 free spins. 5 “Book of Oz” symbols will award you 25 free spins and 100 coins.

Expanding Symbols – Expanding symbols are available during the Free Spins feature. At the start of the Free Spins a special symbol is awarded that can expand. It will do so when a matching symbol lands anywhere on a line. In theory you can end up with the reels filled with the same symbol. If you don’t like the symbol awarded then you can reshuffle, but you must take the one awarded after the reshuffle. Free Spins can be re-triggered.


Book of Oz: Lock ‘n Spin is an excellent looking game that is based heavily on the Wizard of Oz stories and is a new version of a Microgaming slot released last year. The most important symbol n the slot is the Book of Oz, which acts as Wild and Scatter. The reel lock feature is an excellent addition and is used properly has the potential to further reduce a house edge that is already sitting at a very competitive rate. This slot is lacking a bonus feature or two, but what you get is good and as such I would recommend it.

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