Description

«Rivers», sometimes referred to as «FourRivers», «Shisen» or «Shisen-Sho», is a tile-based game which usesMahjong tiles.
The aim of the game is to remove all tiles from the board. Only twomatching tiles can be removed at a time. Two tiles can be removedif they can be connected by up to three horizontal or verticallines which pass only through empty spaces. The game is over iffuture moves are not possible and tiles are left on the board, orthe player successfully removes all the tiles.