The second entry in Mike Fitzgerald's 'family' card games for The History Channel, the 20th Century Time Travel Card Game uses a deck of 100 cards (1901-2000), each replete with major historical events of that year, to play a rummy-like game of collecting decades & getting rid of your hand. The time travel theme is echoed in the direction of play... if your last card played is later than the last card of the previous player, play continues clockwise. If your last card played is earlier, you move 'backwards in time' and play now goes counter-clockwise. - BoardGameGeek