Simon's Slots introduces the innovative Simon's Mastery mode to your classic slot machine experience. Simon's Mastery is a matching challenge that provides an additional layer rewards and enjoyment while playing Simon's Slots. If you're looking for a pure classic slots experience, without Simon's Mastery, Simon's Slots can be tailored to suit your preference. 

Via the Settings menu (accessible through the Lobby by clicking the gear icon or through the Menu button while in a machine) you can enable and disable Simon's Mastery.