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Phantasy Star IV General Improvement

Hack of Phantasy Star IV: The End of the Millennium


The purpose of this hack is to enhance the already excellent gameplay experience of Phantasy Star IV. This was primarily achieved through refinement of the script and the elimination of numerous bugs. Other enhancements include the introduction of new items, the inclusion of two dummied enemies and one lost technique, making the naming conventions more consistent with earlier games in the series, tweaks to stats and abilities, and more.

We’re currently on version 1.1, the second release of this hack. 1.1 corrects a few minor bugs and makes small changes to the presentation. The primary content is largely unchanged from 1.0.

This hack was built from the ground up using the Phantasy Star IV Disassembly document by lory1990, available on this site. Please see the readme for complete details, and thank you to everyone who tries the hack!

Note: The difficulty level in this hack has not been increased in any way over the vanilla game. I’m adding this note in response to a review where the user appeared to be under the impression that the difficulty in the hack had been increased, leading to a bad user experience.

ROM / ISO Information:

  • Database match: Phantasy Star IV (USA)
  • Database: No-Intro: Genesis (v. 20210226-213851)
  • File/ROM SHA-1: BC7FF6D6A8408F38562BC610F24645CAD6C42629
  • File/ROM CRC32: FE236442



RHDN Hack ImageRHDN Hack ImageRHDN Hack ImageRHDN Hack Image


ContributorType of contributionListed credit
FauntleroyOriginal WorkCreator
lory1990HackingASM Support

User Review Information

Good Ideas but Frustrating

Reviewed By: AceRimmer on 30 May 2023

EDIT: I do recommend this mod- w/ one caveat. I was getting crushed by frequent Crit hits, so I manually edited enemy dexterity, dropping most by 10%, so crits still happen but are more rare- like they should be. It was a great time afterwards.

ORIGINAL: Firstly, there’s been some good changes here. Having to manage resources and actually use items to be successful. Some unique changes to monster AI and abilities. Be smart about when casting magic and using skills as MP requirements are about doubled. It keeps relatively standard meseta and XP levels, except tougher fights get better rewards. Also, boss fights feel like legit bosses. Love it!

Now why I don’t recommend: even w/ best current equipment and higher than average levels, it’s not unusual to have someone KO’d in one turn- even when defending. Enemies seem to have much higher crit levels, so you get hit twice at full HP and you’re dead. Chaz got killed 4 straight times trying the Zio Tower. Resurrection remains limited to Moon/Sol Dew and Rever which is later game (and HIGH MP), so it can be slogging early on or just gotta grind. Too bad, some cool stuff here.

Version 1.1 Recommended - Yes

User Reviews
Good Ideas but FrustratingAceRimmer30 May 20231.1Yes
A great way to re-experience PSIVGavin the Demon20 Oct 20201.0Yes