Mysterious is a gothic-themed slot set in a haunted Victorian mansion, featuring a 4x6 grid that offers 256 ways to win in the base game. The game includes three character modifiers – the Lord, Lady, and Baron – who can trigger wild transformations, symbol reveals, or multiplier wilds. Two distinct free spins modes, Locking Multiplier Free Spins and Resurrecting Roaming Wilds Free Spins, provide players with choices for high volatility thrills, expanding ways to 4096.