initial scene-detection algorithm + cleanupPerceptual hashing... that's the cool shit. I mean, my "advanced" perceptual hashing algorithm is really dumb right-now, literally just taking a sum of all pixels in the frame, and yet, it's good enough to detect when a _bunch_ of pixel-values change from frame-to-frame. I bet that with a bit more tweaking, like normalizing the frame wrt. the palette, I can get some even better results. I also have a "true" hashing implementation, where each frame gets a unique hash. It seems to be realtively collision-free. That said, there are times where there are collisions, namely in Metroid, where the game likes to reuse screens. I'll have to figure out how to deal with that... So, what's the next step? Whenever a scene changes, take the hash of the new screen, and see if it matches up with anything we've seen before. That way, we can have "re-enterant" scenes, which is a key to being able to save/load tiles!