https://archive.org/details/sms_mods_and_romhacks_collection_20260409_patched
My personal collection of Master System Romhacks, in an already patched and ready to play ROM format. Most games are patched by myself, but not all are tested. Each .sms file comes with a text description, copied from the places where I downloaded the Romhacks (but sometimes also from README files, random blogs and other websites too).
- 110 Romhacks across 53 different games (or across 52 games, depending on how you process data and count).
- Download one package size: 9.7 MB
- Unpacked size: 44 MB
flat structure: mastersystem_mods_and_romhacks_collection_20260409_patched_flat.7z
mastersystem_mods_and_romhacks_collection_20260409/
Alex Kidd in Miracle World_Snappy Snorg and the Seven Silver Stones v1.4.sms
Alex Kidd in Miracle World_Snappy Snorg and the Seven Silver Stones v1.4.txt
or sub structure: mastersystem_mods_and_romhacks_collection_20260409_patched_sub.7z
Master System Mods and Romhacks Collection 2026-04-09/
Documents/
Alex Kidd in Miracle World/
Snappy Snorg and the Seven Silver Stones v1.4.txt
Games/
Alex Kidd in Miracle World/
Snappy Snorg and the Seven Silver Stones v1.4.sms
Both contain same files, just different file structure.

I want to highlight a few mods (because this question will come up eventually :-) ):
Alex Kidd in Miracle World_
Sonic_
Sonic 2_
Phantasy Star_
Super Boy 4_
(Note, Super Boy 4 is an unlicensed game in Korea that is a bad knock-off clone of Super Mario games. It has this uncanny effect of Mario games, but just in bad and wrong.)
Wonder Boy 5 Monster World (E)_