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Take some time to experiment as you collect new saber crystals and find a combination that works for you. Green lightsabers will yield extra health points when you defeat enemies and blue will recharge your force powers faster. For instance, the default red you begin with will cause more offensive damage. Changing the color of your lightsabers can provide tangible gameplay bonuses. Those saber crystals we just mentioned? Aside from making your lightsaber look all pretty in different shades cool, they have practical uses.
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Collecting the games various Holocrons will yield you upgrades to health and force power bars, as well as new crystals for your lightsabers, alternative costumes and extra experience points. In The Force Unleashed II, the collectibles actually door more than earn you a trophy/achievement.
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