WinStar Casino is the largest casino in the world with a 400,000-square-foot casino complex featuring 10,500 slot machines, 100 table games, 55 poker tables, 800-seat bingo hall, 17 restaurants, the Lucas Oil Live entertainment center and a golf course.

All in all, there are free slots that pay real money, but you will have to be playing at real money online casinos as opposed to social casinos on slot apps, or playing titles in demo mode.

One of the best slot apps that pay real money has to be the FanDuel Casino app, mainly due to the excellent selection of slot machines that they have available at the gaming site.