Mystery Event: Put 'Em on Ice

Event Overview:

"Hey mobsters, it's time to show how cold blooded you can be! The weeklong Mastery Event: Put 'Em On Ice starts today (Because we slowly roll out new events and features to ensure stability within the game, this event may not be immediately available to all players.), and you’ll want to fight your way to avoid freezer burn and show your enemies who's truly the coolest. In addition to earning bragging rights for each foe you ice, you’ll gain mastery in the art of icing and receive super cool mastery rewards! Check out the FAQ for more details, and good luck in your journey to becoming an Ice Cold Master!

–Mafia Wars Blog

This mystery challenge lets you increase your Ice Mastery bar each time that you ice another player. Once you have enough ices under your belt you will be rewarded the mastery item for your current level.

You can repeat this mystery event up to 5 times, but it will cost you 60 RP each time that you chose to repeat the challenge.