Collect all the diamond-shaped "gems" by landing on or passing over them with the green "ball" without getting blown up by a mine.
Place the green ball in motion by touching or clicking any square other than the square occupied by the ball itself. As the name of the game implies, the ball will remain in motion toward the touched/clicked square following a straight line -- diagonally, horizontally or vertically -- and beyond unless forced to stop either by a "wall," a "stop square" (broken circle) or a mine. If the green ball comes into contact with a mine and is blown to smithereens you may undo and play on but with a "death" being registered by the game and the knowledge you have failed in your mission.