Sometimes if a chip isn't emulated or dumped and is faked with guess code then the game can run but the "game" as it was made is not working. Maybe not the most simple concept for users but what you are seeing running absolutely may not be the game that was written in some cases. Just because you see the graphics and can move around the screen, you are still looking at a broken piece of shit that would make the game author roll his eyes. Take for example a chip that has an undumpable rom that handles enemy behavior. Without it enemies have no AI and just walk straight and fall off the screen instead of attacking you. You could still walk through the game and see the ending, but it's broken shit. It's not working.
In some cases a shared file could have gotten fixed for squashing another game's bug and accidentally fixed another game, and could still be marked as broken for a while because nobody's realized it is fixed yet.
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