Sen So uses a unique set of octagonal cards and card holders. This provides fast play for even large numbers of players. Sen So is a pure strategy game. Each player has to think ahead of opponents by placing and then revealing cards together. Each game takes about 20-30 minutes, so we'll play a mini-tournament. Sign up and receive the "Jo Staff" our 2007 promo card. Finalists will receive a headband, and the winner gets a FREE copy of the game.