Marina Bay Sands, operated by US gambling group Las Vegas Sands, was fined us$ 106,000 for the disciplinary breaches, while Genting Singapore's Resorts World Sentosa was fined us$ 81,620, the Casino Regulatory Authority said on its website.
The breaches - which occurred between November 1, 2011 and April 30, 2012 -include allowing some local residents to enter or remain in the casinos without paying the required entry levy, and failing to prevent minors and several banned individuals from entering the casinos.
Under Singapore law, casino operators must ensure that Singapore citizens and permanent residents seeking entry into their casinos pay entry levies of us$ 81.6 a day and us$ 1,632 a year, and check that these patrons don't exceed their allotted period of stay.
Operators must also ensure that all patrons are at least 21 years old and haven't been banned from entering casinos under mandatory or voluntary programs.