Long story short: I played the sequel/remake of this game, Jet Set Radio Future, on my roommate's Xbox while in college. It was great, but I could only play while my roommate allowed me to (he was a real jerk), and for a long time I tried to find a way to play it again in some form.
About 3 or 4 years ago I found out about a port of the original game for the Gameboy Advance which I tried to map before failing dramatically because of insufficient skills. There were simply too many off-screen areas I couldn't capture. It also became obvious after a bit that each location was made of several smaller maps with seamless transitions between them, and putting neighboring maps together showed just how much cheating there really was in how they were supposed to go together.
Oh yeah, and the game sucks pretty bad in my opinion. Then again, the original game was much less fun than the sequel from what I've seen, and a 2D port of a 3D game was bound to be worse.
Anyway, I recently decided to give it another try as a side project and it turns out that my improved skills at finding and manipulating variables in memory helped tremendously. I was able, with minimal effort, to capture the entirety of every sub-map so far without having to extrapolate or remove anything aside from cutting off the empty black areas, and you can clearly see the transition areas where only a partial representation of the upcoming area is actually there.
This is also the project that I left unnamed in my "Always check the file format when saving a file!" thread for those who were interested. I didn't mention it then because I wanted to avoid the inevitable "Why are you wasting you time on so many project at once!" comments
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Seeing as this is a side project I only restarted because of my love of isometric graphics, so far I've only mapped most of the stage layout without any objects except the "graffiti souls", as well as two actual mission maps with all the paint cans and tag placements. I'm not putting any real effort in finishing this project at the moment and only spending time on it to distract me from my other existing project whenever they get on my nerves. In short, I'm admitting upfront that this is unlikely to be finished anytime soon.
(Now watch me finish the whole thing in record time after such an arrogant disclaimer)
Let's begin with the first two missions.