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Recent Updates

Metroid + Saving Unofficial Update

Hack of Metroid


VERSION 0.5.2 IS OUT! It now runs on Nestopia even with the RNG, and the aforementioned palette issue is hopefully gone. It also fixes a health bug on the (very short-lived) 0.5.1 version, and makes missile pickups more abundant

An update to the famous Metroid + Saving hack initially designed by snarfblam. Based off the well-hidden 0.4 version (which included wall jumping and a corner map), this version tends to improve some of the graphical issues of that version and add in new content on top of that.

New content includes:

  • Reductions in missile door cost (5 missiles to 1 with red doors and 10 to 5 with yellow/purple doors)
  • Manual saving via Up+A
  • Restored Japanese RNG
  • Sped-up door transitions
  • Morphball glitch initially not seen in original game fixed
  • Continuing refills all of your health, including energy tanks, instead of starting off at 30 HP every time.
  • Missile pickups now drop more frequently and give 5 missiles instead of 2.

You’re allowed to use this hack as the base of your own hack or on other, already existing hacks (please keep in mind that the ROM of the hack must be expanded). If you would like to leave feedback on the project, please do so. This project was done with the idea of making Metroid a much more enjoyable experience, so if there’s any issues with the current version you’d like to see fixed, feel free to leave feedback or critiques in the review section. Special thanks to snarfblam for making the original + Saving hack.

ROM / ISO Information:

  • No-Intro Name: Metroid (USA)
  • (No-Intro version 20130731-235630)
  • File SHA-1: 166A5B1344B17F98B6B18794094F745F8A7435B8
  • ROM SHA-1: FDBFC7871962F72A1EF57E5A7E456164FB93430B



RHDN Hack Image


ContributorType of contributionListed credit
SimplyDannyHackingAdded in the new features
snarfblamOriginal HackingCreated the original Metroid + Saving patch

User Review Information

Excellent way to play this classic again!

Reviewed By: Rodimus Primal on 28 Nov 2022

Having been on a Metroid kick as of late, I played through the original Metroid without save states while wishing to try out these save patches. I can verily say this made the original game that much more fun. The save file system looks great, and it still allows you to play the “New Game Plus” feature with Armor-less Samus and still save as well with all your power ups. While the password system was great for its time, being able to save your progress works great for those wishing to take their time looking around and learning the maps of the game. Speaking of which, pausing allows you to see the map much like Super Metroid, which is really helpful.

The mini-map in the corner is a really welcome too. However, it seems to be causing some glitching (a little more like clipping where the sprites will disappear briefly) for anything moving in that section of the screen, which is very noticeable with some enemies on the ceiling and collecting items from the Chozo statues. Nothing that prevents gameplay but it is not there, or maybe not nearly as much, on a vanilla game. Also, when defeating Mother Brain, one of the sprite tiles did not disappear after killing her. Note that I am playing the standard patch, and not the extended ROM patch so I don’t know if that makes a difference. Hopefully this is something that can be fixed in a future update.

While this is a change to the old start with 30 health, having the refill on health is really a welcome addition. This really makes the game more accessible to newcomers and makes getting the better endings to the game a bit easier.

Hats off to the snarfblam for making the original patch, and for Simply Danny for updating it. I completely recommend this for anyone looking to play NES Metroid for the first time.

Version 0.5.2 Recommended - Yes

User Reviews
Excellent way to play this classic again!Rodimus Primal28 Nov 20220.5.2Yes
This is probably the best way to play NES MetroidCallTwilight XXI01 Mar 20220.5.2Yes
Would not play Metroid without this patch!MattKimura19 Jun 20190.5Yes
As described, but some glitchesG30FF17 Mar 20200.5.2Yes