I'm at the part where Sora blacks out when the organization 13 member showed up. Than you play as Riku and with Riku I am already in Notre Dame. But it keeps dropping me back to Sora and I can not for the life of me find Neku and his life partner
I also got stuck on this. I had Riku halfway through Tron before I figured this out. You start off on the orange colored rail... Hit b to jump and then get on the purple rail. Then transfer to the yellow rail and then to the green. The green rail will take you out where you will be thrown off by a save point and can leave the post office. (make sure you go the right direction on the green rail) You will then end up at the fountain plaza. Go past the fountain into the fourth district. You should be able to take it from there. Hope I helped.