If you're looking for a good website , I have one that accepts up to 7 altcoins, with a very user friendly interface, and 3 of the most popular games : Dice, Slots, Blackjack, in addition to the new Lotto system where you buy tickets and compete against other users as to who will win the jackpot.
I tried it myself with some Play money because I'm a wuss, ended up losing all of it, but the thrill is there, so if you wanna have a round, all you gotta do is click my signature. Good luck!
Fortunejack.com accepts more than 7 coins, better interface too.