Forty-two (42) is a four player card-like game played with double-six dominos. It employs bidding and trumps and was sometimes called Four Hand Texas in its earlier days.
It was "invented" in Texas in the late 1800s when card games were considered inappropriate in some Christian associations. (Domino games were okay.)
Rules and info on modern-day 42 are posted at Texas42.net (42 home page).
Here are archived Four Hand Texas rules, quite similar to today's game of 42:.