Tip: Remaking levels from other Mario games is strongly discouraged, especially popular ones (World 1-1 from SMB or SMB3, for example), as their over-presence in Mario games, official or not, often makes them uninteresting to play.
Loads the custom palette of a level depending on the value of $FE. That RAM address is immediately cleared after that, possibly to avoid a custom palette from being uploaded twice.
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