Use ¡ûkey and ¡ú key to control the movement; use ¡ýto collect the falling ball, you can collect more than one ball of the same color at anytime; use ¡ükey to throw the color ball upward. If there are more than 3 balls of the same color in one vertical line, they will be automatically dissolved and you get points. There are two special balls: 50Points ball and Kill-all Ball. You can not collect them directly, but you can dissolve them together with other balls. Kill-all ball can dissolve three line of color balls for you. You can activate the Kill-all ball by pressing space key.