The game is simulation of Contract Bridge cards game. The rules are usual where you (South) have to make a contract of your group (North/South) and prevent to make a contract of opposite group (East/West). Well-known conventions (Take-Out Double, Stayman, Blackwood, Gerber, Strong 2, and Weak 2) are presented and may be used by groups optionally. Also other conventions may take part - Jacoby Transfers, Unusual No Trump, Texas, etc. Also Kibitz mode allows you to be a Kibitzer and look in cards of others.