Designed by Reiner Knizia. Published 1999 by Berliner Spielkarten. For 3-6 players and takes about 30 minutes to play. Age 8 to adult. 56 coloured cards with numbers. Object of the game is to swap one card from their hands with a card from the pool. Each player aims to score as few points as possible at the end of the round. If a player succeeds in achieving a hand with zero points the round ends immediately. After playing a number of rounds, the player with the least points overall is the winner.