Now that NES Crystalis is done I have to share some of the weird stuff I found with that walk through walls code. First of all, I think the game has a bunch of premade "screens" that it uses to build dungeons with. It doesn't lay down 16x16 tiles like most games do. Instead, dungeons seem to be built with 256x240 tiles. In a way, it kind of reminds me of the labyrinths from the original Legend of Zelda. This causes things (like doors and walls) to loop around in places that are normally off camera. I'll post unedited versions of Oasis Cave (from Goa Fortress) and the Floating Tower. The loop around effect is especially visible in the Floating Tower.
I also found a glitch door inside the wall of the armor shop in Portoa. I recorded a video of it and posted it to my Youtube account.
https://www.youtube.com/watch?v=K8ab3058oIwNow to share some codes.
1FF1:04 freezes the background animation, although some places require 1FF1:20 instead.
0051:03 is the most useful code I found. I originally made it to get the HUD off the screen, but then I noticed that it also somehow fixes the nametable viewer in BizHawk, which wasn't working right at first.