Each player is allotted 1000 points initially. Each player have offence and rewards. Each time a player land on offences, some points will be subtracted according to level of offence. Each offence will pollute river by 5%. After committing offence, a player can take quiz to earn points. (Quiz have -ve marking). Each time a player land on rewards, some points will be added according to kind of good deed. Game will end when pollution level becomes 100%Winner will be decided by the total number of points.