Caesars Rewards, the largest gaming loyalty program in the world, has grown 20% as a result of the merger between Caesars Entertainment and Eldorado Resorts.

The loyalty program has been extended to 18 properties following Eldorado’s $17.3 billion acquisition of Caesars in July.

Following the merger, the combined network of more than 55 world-class resorts across the US now includes destinations in Florida, Colorado, Ohio, and St. Louis. Also, customers from each company’s legacy rewards programs were seamlessly integrated into the expanded Caesars Rewards loyalty program on day one.

“Caesars Rewards is a tremendous asset that allows us to understand the wants and needs of our customer database to more efficiently serve them. Now with our expanded network of properties and partnerships throughout the company’s portfolio, Caesars Rewards members have more ways to earn, spend and redeem, providing an impressive additional benefit for our customers,” Anthony Carano, president and chief operating officer of Caesars Entertainment, said.