This is classic backgammon except you can compete live against someone in the world or a friend.
Backgammon is a board game for two players in which the playing pieces are moved according to the roll of dice. A player wins by removing all of their checkers from the board.
A context menu should be shown when right-clicking or, on touch devices, long-pressing in the game. This menu especially allows to play in full screen and control the volume.