Take 2A number bus from Chepauk to reach Chennai Central. This is the only bus to reach central and for every 15mins you will get a Bus. To reach Casino theater from Chennai Central take 11 series bus and get down at Shanthi Theater and take Subway to cross over. Just in 2mins you will reach Casino. Don't take a local to Chintadripet to reach Casino. As it takes lot of your and you have to walk 2kms extra. If you take prepaid Auto from Chennai Central it will cost you around 50 to 60rs.