 In 2009 voters approved a ballot initiative allowing the construction of four new casinos in the state . Thirty months later Horseshoe Casino Cleveland , developed by Rock Gaming LLC and Caesars Entertainment Corporation , became Ohio ’ s first casino , when it opened on May 14 , 2012 . Hollywood Toledo , developed and operated by Penn National Gaming , opened 2 weeks later on May 29 followed by Hollywood Columbus , which opened on October 8 , 2012 . Horseshoe Cincinnati is expected to be the state ’ s fourth and final full @-@ service casino when it opens on March 4 , 2013 . 
