The bonus games in Super Mario Bros. 3 have some quirks which impact their difficulty. This hack remedies these:
Please watch this excellent explanation video by Retro Game Mechanics Explained for more information (See video below).
This hack is compatible with the
https://www.romhacking.net/hacks/5131/.
Database match: Super Mario Bros. 3 (USA) (Rev 1)
Database: No-Intro: Nintendo Entertainment System (v. 20210216-231042)
File SHA-1: A25D2DCBF6EC3634A84318BFE2CFE28D5331D815
File CRC32: E8C3AF69
ROM SHA-1: BB894D104C796F69BA16587EB66C0275F5C2FC02
ROM CRC32: 2E6301ED