Tip: Switch palace switches normally disappear if you replay the level. However, if you insert them as direct Map16 and use the hex-edit at $00EEB2 in the ROM map, you can replay the level without a problem.
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Details for Mario goes to a castle to pay his taxes
Simple, but a fun vanilla hack which looks like Nintendo's original SMW.
I uploaded a gameplay of the hack if you want to see it. https://youtu.be/TRYAh88jdtc
And remember people, careful with taxes haha! Hope to see more hacks from you in the future!
Despite how simple this is, because this is a pure vanilla hack, the level designs are well done, and like Nintendo's own! It's also hilarious that there are references to the whole "Yoshi Commits Tax Fraud" meme. I give this Rom Hack a solid 9/10!