Currently there are a few games that are unavailable in some states in order to comply with state regulations. You can see the full list of games and what states they are not available in below.
All Card-Based Games:
Arkansas
Kentucky
Indiana
Iowa
Mississippi
Pennsylvania
South Carolina
Washington
21 Black Jack:
Oregon
Bingo
Alabama
Arkansas
Kentucky
Mississippi
Washington
Oregon
Illinois
South Carolina
Super Peg Master
District of Columbia
Arkansas
Hawaii
Missouri
New Jersey
New Mexico
New York
Oregon
Texas
Washington