roguelikemike

So, I'm not sure if this is the right place to as this question or not but...I've just recently started playing this fan game (it's AMAZING by the way, I'm especially blown away by all of the new Sprite work), but I am a little confused as to why on some chapters like 4 and 6 it pops up with a "previous chapters" message. Am I selecting a team? Why does it give me an option for 1 and 1x or 4 and 4x?