The game is a 5-reel, 4-row, 20-fixed line video slot featuring Mystery symbol transformation, Wild Substitution and Free Spins with Sticky Mystery Symbol transformation. The mystery symbol appears on reels 3, 4 and 5 in the main game.

When one or more Mystery Symbols land, a random symbol is selected from the Wild, medium or low win symbols, and all Mystery symbols transform into this symbol. The mystery symbol is the Golden Grimoire™, which is shaped like the infamous mysterious book that inspired the game.

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