From the back of the box: At midnight, the clock in the haunted tower rings out twelve times. At this signal the young ghosts take over the tower. Once in the tower, the ghosts begin their party. They sneak up and down the spiraling staircase and through the many rooms, using the trapdoors and hidden entrances to secret passages. They hide in old closets and dark corners. If you enter the tower after midnight you can get quite a scare -- but the ghosts are really friendly creatures who are just having fun! When playing The Haunted Clock Tower, players do not compete to win, but work together to help the ghosts reach the clock tower by midnight. If all the ghosts get there in time, the party can begin and the game is won. - BoardGameGeek