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Check out the v.256 - The Dark Ride: Limbo Patch Notes
here!
I made a tool that helps with spotting the difference, in case anyone might find it useful and didn't want to play it properly.
https://mxldevs.github.io/maplestory_spot_the_difference/
Just print screen in-game and then paste it in the website above.
Here's an example of how it looks, with the differences shown on the right, and a visual indicator overlayed on the left.