Legal online casino gaming in the U.S. is outpacing every other part of the gambling world. More and more people are playing on their phones, and just a handful of states are making serious tax money from those bets.

The demand doesn’t stop at the state line, either. Sweepstakes-based platforms like McLuck let people play casino slots online for free, using Gold Coins just for fun and Sweeps Coins that you can redeem for prizes if local law allows. They’ve got over 1,000 slot games on the site. Whether people are playing at a licensed operator or going through a sweepstakes site, slots are where lots of newcomers start.