In this hack Mario and Luigi have own fiery palette and own fireball color.
NOTE: Since Luigi's fireball is regular green, that's why the underground, the underwater and the castle level types have regular green-color objects as well instead of the cyan-blue one.
NOTE 2: This hack was done in MMC3!
Database match: Super Mario Bros. (World)
Database: No-Intro: Nintendo Entertainment System (v. 20210216-231042)
File SHA-1: EA343F4E445A9050D4B4FBAC2C77D0693B1D0922
File CRC32: 3337EC46
ROM SHA-1: FACEE9C577A5262DBE33AC4930BB0B58C8C037F7
ROM CRC32: D445F698