Translations:Super Mario Bros. 3/9/en

Originally, it appears that this menu would have been accessible from the "1 PLAYER" / "2 PLAYER" selection menu if Player 2 was holding A + B. It is also possible that this served some other purpose, but the above menu would be the most likely candidate. See Disassembly source for PRG bank #24, search for "Title_Do1P2PMenu:" Interestingly, the button check is still there but the action it was supposed to perform was overwritten with a series of (no operation) instructions, likely done just before release.