1. Added Light Weight(DX9) version which is even less demanding on PC's performance.

2. Fix a bug that causes two balls to come out in plunger lane simultaneously.

3. Adjusted collision detection.

4. Fix a bug on kick back that causes kick back to kick twice even when it is not Next Double.

5. Fix a bug that causes the gameplay to stop when a ball goes down a drain after a pause.

6. Removed an effect to turn off the light on GAMEOVER.

7. Added some sound effects.