Dragon Quest V: 4 Party Members (corrected)
ドラゴンクエストV 天空の花嫁 · Dragon Quest V: Tenkuu no Hanayome
A working version of the four-member party hack for Dragon Quest V on the Super Famicom, made for DeJap's English translation.
What it does
The Super Famicom Dragon Quest V only lets three characters fight at once. Mr. 45's 2007 Japanese hack raises that to four, and AustNerevar later converted it for DeJap's English translation. That conversion was off by 512 bytes because of a ROM header mix-up, so the feature never switched on and the game crashed at the first party setup. RadMageIRL found the problem and published a corrected patch with the analysis behind it.
Credits
The hack itself is Mr. 45's work; RadMageIRL's patch only fixes how it was applied. Thanks also go to AustNerevar for the first conversion and to DeJap Translations for the English script (v2.01, 2002).
Playing it
The patch goes on top of DeJap's v2.01 English translation applied to your own copy of the Japanese game, and the header must be handled exactly as described. The repository linked here has a build script that checks each step for you; follow its instructions.