The Golden Grimoire is based on a fictional spell book, and it uses five reels and forty fixed paylines. You'll be spellbound by the special features that the Golden Grimoire slot game offers as the Mystery Symbol Feature can transform the symbols on the reels into matching symbols, plus there's a Free Spins Bonus to enjoy.

Our Verdict: NetEnt is known for producing online slots with intriguing special features such as Avalanche Reels in Gonzo's Quest and Walking Wilds in The Invisible Man. In the case of the Golden Grimoire slot, there's yet another dazzling feature to behold, and it's called Mystery Symbols. But not only can the spell book symbol cause the reels to fill up with matching symbols as you can also enjoy sticky Mystery Symbols in the Free Spins Feature as well as sticky wilds.

The betting range for Golden Grimoire means that every type of player can enjoy it, with the smallest stake being just 20p and the largest being £400.

Design: As soon as you open the Golden Grimoire slot on your chosen device or desktop, you can almost feel a magical power emanating from the game. As intense music plays, you get to feast your eyes on the sorcerer's study which forms the backdrop for the slot, and you'll even see some of the objects on the tables start to levitate when winning combos are created and special features are activated.

Golden Grimoire lets you create wins from left-to-right on adjacent reels, starting with Reel 1. Prizes are awarded by landing three or more matching symbols such as the diamond, the club, the heart, the spade, the gemstones, and the keyhole on an active payline.

There are several configurable options available to you, including Auto-Play which spins the reels automatically a selected number of times. You can also increase and decrease the bet level and coin value, turn the sounds on/off, read the rules, and place the maximum bet with a single click.

Wild Symbol: The wild symbol in the Golden Grimoire slot is the grinning gold skull. However, NetEnt has chosen not to offer it as a standard paytable symbol which makes the gameplay far more interesting. So, if you wish to benefit from its powers of substitution, you'll first need to unlock the Free Spins Bonus.

Bonus Features: The Mystery Symbol Feature is one of the biggest attractions of the Golden Grimoire slot game as it can make a significant difference to your winning potential. It's activated when one or more Spell Book symbols is anywhere in view, and it turns all Spell Books into a randomly chosen symbol at the end of the spin as well as any that lie between it and the symbol on the same row of the leftmost reel as long as they match. The wild symbol can also be awarded through the Mystery Symbol Feature.

Golden Grimoire awards the Free Spins Bonus when three scatters land on the reels. During the bonus, all Mystery Symbols become sticky.