New collections have appeared in Mafia Wars today, but you'll have to head over to Sin City to find them. These four Las Vegas Collections are part of Zynga's gradual update to the city and provide impressive stat boosts like permanently increased health, energy and increased loot drop chances.

Check out what you'll need to find, and more importantly, what you'll win after the break. Log into the game and if you don't already see the Las Vegas Collections promotional banner, just check your profile and find them under the "Collections and Vault" tab. Here's each of the four collections and what you'll need to find while you're doing jobs in Vegas:

The Cactus Collection (+30 Health):

• Christmas Cactus
• Silver Cholla
• Cottontop Cactus
• Hedgehog Cactus
• Prickly Pear Cactus
• Barrell Cactus
• Saguaro

Mojave Animals Collection (+10 Energy and +10 Stamina):

• Jackrabbit
• Coyote
• Roadrunner
• Rattlesnake
• Kit Fox
• Golden Eagle
• Mountain Lion

Poker Hands Collection (+20 Attack and +20 Defense):

• Pair
• Two Pair
• Three of a Kind
• Full House
• Four of Kind
• Straight Flush
• Joker

Matchbooks Collection (Ten percent drop rate increase while in Vegas):

• Loot Isle Casino
• Camelot Hotel
• Giza Las Vegas
• Florentine Resort
• Soft Rock Casino
• Jersey, Jersey
• Planet Bollywood

Head on back over to Las Vegas for a chance at improving your character even further, but don't forget to bring back the Rat Pack while you're at it.