Swap Mode: Swap the crystals by clicking or draging them in order to make matches of three or more crystals of a same kind. Any kind of crystal gives you a bonus which you can use to clear all the crystals of it on the stage. Click mode: Destroy all the crystals by clicking them in groups of same kind. You need to use a mask if you want to remove a single crystal. Any kind of crystal gives you a bonus which you can use to clear all the crystals of it on the stage.