Homebrew programmer Dennis Debro wanted to make a version of Pac-Man on the Atari 2600 that was more faithful to the arcade original, and that's exactly what he did with Pac-Man 4K.
Using the same memory constraints as the underwhelming 2600 port, Debro managed to not only make a much more arcade-true maze layout and color scheme, but also drastically improve how the ghost AI works. He even added in extra fruit!
I wonder what it would have taken for programmers in 1982 to make a game anywhere near this accurate, or if this is a product of better tools. Either way, Pac-Man 4K looks pretty great and is available on Atari Age for $25. If you pick a copy, you also get a free magnet.