Set the time on the clock to 6 o'clock to start the game.
Decide who will go first (player 1 ) and who will go second (player 2 ).
Take it in turns to choose to move the hands of the clock on by 12 hour or by 1 hour. For example, player 1 could choose 12 hour, so the clock hands move to 6.30, then player 2 might choose 1 hour, moving the clock hands to 7.30 ... etc.
The winner is the player who moves the hands exactly onto 12 o'clock.
Can you work out a winning strategy so that you can always beat your opponent?