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The free online Mystic slot is created by Games OS and is inspired by Halloween and Horror movies' spooky characters and symbols. It is possible to play the Mystic free slot without previously downloading it ; there is no need for registration as well. How to Play Mystic Slot Machine Game? The slot machine has 9 lines in total. You can change the number of lines you wish to play with by pressing the Lines button, and the stake per line by clicking on the + and - sign, which is right above the lines field. The minimum wager per line is 0.20 and 1.80 per spin. In the middle of the screen, you can see the Max Bet button which automatically changes to the maximum wager per spin - 18 and 2 credits per line. Next to this field, there are Spin and Auto spin buttons, respectively.