In a Clock or Round the Clock game each player takes turns to throw 3 darts and is required to throw a dart in every segment starting from 1 up to 20.  Players must start with 1 and cannot proceed to the next number until a dart has been successfully thrown at the current target segment. The first player to hit all the targets and then finish on a 20 wins.

You can also play a more advanced version of the standard round the clock game. In Clock+ the game proceeds as in the standard game except that a treble will advance your score 3 and a double 2. For example, if you are aiming for 5 and get a treble, your next target will be 8. To finish you must hit a bulls eye.

To play one of these game types change the 'Game Type' option in the 'Settings' menu.
