Crystals are the game's premium currency. Connect to Facebook to earn free crystals.

Every time you play, you have to spend one energy unit from your battery, out of its maximum capcity of eight units. Energy is replenished every 30 minutes automatically. If you consume all the available energy from your battery, you must wait to play. You can instantly restore all your energy by advancing the time on your device by 240 minutes. Afterwards, set the time to its correct value.
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