Super Mario Bros. 3: The Forgotten Worlds (SMB1 Hack, by Szemigi) - Full Walkthrough
https://www.romhacking.net/hacks/3546/
This hack is a classic, if you enjoyed the trippy World 9 aesthetic of the original SMB2j, you're going to love this. Apparently the story behind it is that Bowser's Ghost managed to kidnap Princess Peach and put a spell on Mario and Luigi which doesn't let Mario shoot fireballs, whereas Luigi cannot jump like he can originally. Beat 4 dreamy worlds and rescue the princess!
On the downside, some of the design choices may be questionable, the level settings are quite all over the place. I do appreciate the new ideas and attempts at being creative though ;)
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