You can jump over one ball or a row of balls of the same color with a ball of different color. The longer the row the more points you gain. When there is no move left - the game is over. That's all there's for the Remover mode. In the Collife mode, if your move is a jump over just one ball, one more ball drops on the board in a random position. There is a big bonus if you manage to remove all the balls from the board.