This is the first technique Yusuke learns, Koenma taught him to use it. Spirit energy will gather in his index finger and Yusuke can shoot whenever needed. At first Yusuke could only fire one a day, but as the series goes on he can fire four and then at the end he has unlimited, untill his power runs out. Yusuke uses this technique most. a.k.a Rei Gun
This is Yusuke's second technique he learns after he wins Genkai's turnament. This technique is a long range attack, and shoots out little Spirit Guns that are not as powerful as just the one. Yusuke really only uses this technique during the Saint Beasts series, in his fight with Suzaku.
a.k.a Rei Kou Dan
This technique requires the body to be a conductor for spirit energy, and is a close up attack. This attack is only meant for one blow, but it is very powerful. Yusuke didn't fully master the technique, but he still uses it in the Dark Turnament. a.k.a Rei Kou Ha