Selected number of Microgaming online casinos offer a free play promotion. “Free Play” allows the online casino player a chance to try out the casino games risk free for a hour with the cash of winning real money. When playing the online casino will start the player out with a certain amount of credits, with those credits the player then tries to increase the overall casino credits by winning. At the end of the session if the overall win is higher than what was the starting balance, the player can then cash out. All the online casinos do require a small purchase to withdraw winnings.
While many did enjoy the free play casinos, the offers have ended. No casino gives this type of promotion any longer. You can still get free money but not the same as it was prior and amounts are less.