BTW, if I DO write a 'how to ROM hack' section on my blog, it's not going to be a one page, this is so easy, why isn't everyone doing this tutorial. It's going to be like 10 loooong pages of 6502 ASM lessons before you even get to changing the color of Mario's hair. There's no shortcuts to understanding this stuff. When I started I read this monster 500 page document on 6502 ASM (and 65816) before I even started to try something. And I wrote about 20-30 test programs in 6502, and went step-by-step in a debugger to make SURE I actually do understand what's happening, what every instruction does, why it does it, what the flags mean, etc.