Sweet Fever is based on a Chinese Solitaire called Shisen sho, and this is based on the legendary Solitaire Mahjong or Taipei. The game is a set of tiles in one layer.
The aim of rivers game is to clear the board by pairing up all the candies and sweets. The pairs can be eliminated if they are adjacent to the same or if you can connect virtually with no more than three lines. This imaginary line can not pass through any other tile. The distance to be between tabs does not matter. When finished with the entire board, you move to the next board.