Last year Microgaming Software has launched a new way of promoting. These casino's now offer "Money on the house" or "Free hour"bonuses. It means you download the software, signup and when you open the casino you have a certain amount of money in your account and a limited time to make as much as you can. After the time is up, if you can claim any winnings, you make a minimum deposit to claim your bonus money. The great thing about Microgaming Casino's is that in most cases you can cash out your cash balance whenever you want, only your bonus amount will be set to zero. Never wager your entire bonus, cash in that big win when you want! Most Microgaming casino's accept US players.
Some tips: The original starting amount can never be claimed. Is you have to wager an amount 10x, play bet max or else you will never make it.