Fill the circular play area with color by scoring points. Losing points causes the play area to lose some of its color. If you manage to completely fill the play area with color, you complete the level. Lose all your color and you must restart the level.
Use your player cursor to deflect the colored balls. When you deflect a ball, it will accelerate toward the edge of the circular play area. If an accelerating ball leaves the play area in a region whose color matches the color of the ball, you score a point.
Deflecting these is optional. If a solid-colored ball passes through the play area without being accelerated by the player cursor, nothing happens. Once accelerated by the player cursor, however, the ball must leave the play area in a region whose color matches the color of the ball or you lose a point. Succeed and you gain a point!
Deflecting these is a priority. If they exit the play area in a region whose color does not match the color of the ball, you lose a point, even if the ball has not been accelerated.
Avoid these. If they touch your player cursor, you lose a point. To destroy them, score a point by any means before they reach you.