Routine 4 is a stub function: it doesn't have any logic. If the camera remains low and instead leaves the vicinity of the pool to the right, routine 2 again reloads the yellow colors, but instead advances the current routine to 4. There's another code path for it to take, though. Conversely, if the camera goes back up, routine 2 reloads the yellow background colors and resets the current routine back to 0. When the camera dips far enough below, routine 0 loads the underwater brick colors as seen above, and changes the current routine to 2. Hydrocity Zone 1 has three of them, and they're arranged logically like so: Okay, one last glitch with the resize routines. Furthermore, the code itself was later replicated on the Sonic & Knuckles cartridge, so they had another chance to fix their mistake. Admittedly the error isn't as obvious on real hardware, but there was no reason to hammer the values into the code like that.
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