"It's All In The Cards"

We found Genai's house, and he gave us these cool digimon key cards, which Myotismon used to open the gate to the other world.  However, there was one to many card, and the cards had to be put in the right order in order to get to the right place, which we didn't know.  In the castle, when trying to open the gate, we were attacked by Dokugumon, and almost didnt get out.  But through the gate, we finally got home.  Now there is only one more problem.  How do we stop Myotismon?