Super Mario Bros. Halloween Hack was a personal project developed for fun years ago. It was never submitted anywhere as it laid forgotten on a personal computer until now.
This hack changes the color of the overall world and changes the sprites of enemies and Mario to be Halloween themed. Worlds are more or less the same except for a few small touches. However, the final levels of the worlds have a makeover.
Database match: Super Mario Bros. (World)
Database: No-Intro: Nintendo Entertainment System (v. 20210216-231042)
File SHA-1: 33D23C2F2CFA4C9EFEC87F7BC1321CE3CE6C89BD
File CRC32: 393A432F
ROM SHA-1: FACEE9C577A5262DBE33AC4930BB0B58C8C037F7
ROM CRC32: D445F698