Megaplier is $1 per play and is currently available for non-CA users only. 

The Megaplier feature can multiply non-jackpot prizes by 2,3,4, or 5 times! The Megaplier number is drawn before each drawing from a pool of 15 balls, five marked with 2X, six with 3X, three with 4X, and one with 5X. Jackpots are not affected by the Megaplier. 

After you’ve picked your numbers for a Mega Millions ticket and are in your Shopping Cart, click the button to “Add Megaplier” for $1 to your selected ticket.