i can't really say it expands it but it replaces the levels with new ones. try Cloudy Super Mario Bros. U! I give it a 10/10. look up funky scott's video on how to get it to work! if you got any questions, my discord is jxndriel, and im quite active on pretendo

there Cloudy Super Mario Bros U 2, I highly recommend it, it is not an expansion as such because it replaces the levels with others