round the clock -> any of a number of game variants where players compete to be the first to hit all the sectors on the board in an agreed order, usually numerical finishing with the 20,[3] although sometimes with the outer bull followed by the bull. in some versions hitting a double entitles the player to skip the next number, with a triple entitling the player to skip two numbers. also commonly played by single players as a form of practice; also known as around the world.