Different spells have different effectiveness, depending on your opponent. Usually, the variations are only with Voldemort. The first spell, where you touch the dots that appear, is the easiest to do. And if you get all the dots, It can take away half your opponents life. But Voldemort usually blocks all of the shots, so it's not advised against him. The second spell, the tracer is hard. You have to go along the line before it dissapears. If successful, each hit takes 1 heart from the opponents health. You get multiple chances at the spell too. But one problem is that opponents sometimes dodge them, Vampyr Mosps especially. Against Voldemort, the tracing is harder, does not do as much damage, and is occasionally blocked. The third spell, connect the dots, is my favorite and is quite effective. To do this spell, you must touch the first dot that appears, and drag the stylus across the screen to the next one without letting up, and so on and so forth until you run out of dots, or lift your stylus up. If successful and at full power, It will bring an opponent down to two hearts. This spell is probably the best to use against Voldemort, but does only a little more that 1 hearts worth of damage.