Instructions
Enter a battle with an enemy and take critical hits. A critical hit from an enemy empties certain slots in the bonus board. Any crystal bonus not touching another bonus of the same color will shatter. If the crystals are touching crystals of the same color on the bonus board only half of them will break. (Ref 2)
Save your game from the in-game menu.
Turn off your Xbox 360 and turn it back on. Reload your "Star Ocean: The Last Hope" game and open your last save. The bonus board will be empty when you restart your game.