This hack alters all of the original game's levels and features some modified player and enemy behavior. Its difficulty is overall harder than the original SMB but not too crazy.
Features
-32 new levels
-wacky new colors!
-themed worlds! (kinda)
-more aggressive enemies
-Luigi!!!
-and more???
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