42, also known as Texas 42, is a trick-taking game played with a standard set of double six dominoes. 42 is often referred to as the "state game of Texas". Tournaments are held in many towns, and the State Championship tournament is held annually in Hallettsville, Texas on the first Saturday of March each year. In 2011 it was designated the official State Domino Game of Texas.

Hallettsville is a city in Lavaca County, Texas, United States. Its population was 2,731 at the 2020 census. It is the county seat of Lavaca County. Hallettsville also has a sizable German-Texan population, as the town founders were mainly German and Czech immigrants.