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Sonic in SMB1

Hack of Super Mario Bros.


A character hack of Super Mario Bros. that replaces the famous plumber with the equally-famous (okay, not really) hedgehog. Features drastic changes made to emulate the Genesis Sonic games.

See the readme file for more information.

ROM / ISO Information:

  • Database match: Super Mario Bros. (World)
  • Database: No-Intro: Nintendo Entertainment System (v. 20210216-231042)
  • File SHA-1: EA343F4E445A9050D4B4FBAC2C77D0693B1D0922
  • File CRC32: 3337EC46
  • ROM SHA-1: FACEE9C577A5262DBE33AC4930BB0B58C8C037F7
  • ROM CRC32: D445F698



RHDN Hack ImageRHDN Hack ImageRHDN Hack ImageRHDN Hack Image


ContributorType of contributionListed credit
taftqHackingEverything before version 2.0, most of versions 2.0 and 2.5
GlitchyTSPHackingVarious contributions to version 2.0
ThroughT1m3HackingVarious contributions to version 2.5
StudsXHackingCreated the power-up patch used for the hack
KengenOriginal WorkCreated Sonic the Hedgehog in Super Mario Bros., which inspired this hack

User Review Information

Fun Little Hack That Could Use Some Visual Tweaks

Reviewed By: delta7890 on 06 Sep 2022

This is nice! Sonic’s sprite looks great here, and he plays as you’d expect. A couple things stand out to me that look visually odd to me though:

First, Sonic bobs up and down as he walks and runs. While this is consistent with Mario’s original sprite, it looks off for Sonic, who remains level in his walking and running animations in his own games.

Second, when tossing a fireball in midair, there’s a single frame where the top half of Sonic’s body will appear to “pop out” of his rolled-up sprite. If possible, I feel like it might look best to simply have Sonic remain rolled up when tossing a fireball in midair.

Version 2.5 Recommended - Yes

User Reviews
Fun Little Hack That Could Use Some Visual Tweaksdelta789006 Sep 20222.5Yes
A worthy successor.Kengen31 May 20222.5Yes