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Sonic 1 Bugfixes & Optional Act Palettes

Hack of Sonic the Hedgehog


This hack aims to fix as many bugs as possible using SCHG tutorials online. Fixes:

  • Dynamic Palettes Per-Act (Optional)
  • Fixed Demo Playback (Unnoticeable and not needed as speed cap fix ruins this)
  • “PRESS START BUTTON” appears
  • Walk-Jump Removed
  • Fixed Ring Timers and added quick blink animation
  • Special Stage jumping responds to button presses like the normal jump (hold to jump higher)
  • Sonic collides with water after being damaged
  • Removed speed cap (mentioned above)
  • Sonic now has the Super Dash Attack or Spin Dash from Sonic 2
  • Fixed the death boundary bug
  • Fixed the camera follow bug (barely noticeable in-game)
  • Fixed the water palette on the Title Screen to be consistent with gameplay
  • Spike Behavior fixed
  • Sonic’s walking animation has been tweaked to look like the 2013 mobile version and Sonic movie credits
  • Fixed a “remember sprite” bug where objects appear destroyed when they aren’t when RAM is full (only noticable in Debug Mode)
  • REV01 Background effects ported
  • Fixed scattered Rings underwater physics

ROM / ISO Information:

  • Database match: Sonic The Hedgehog (USA, Europe)
  • Database: No-Intro: Genesis (v. 20180824-045026)
  • File/ROM SHA-1: 6DDB7DE1E17E7F6CDB88927BD906352030DAA194
  • File/ROM CRC32: F9394E97



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User Review Information


Reviewed By: aorin1 on 28 Jul 2023

There are more changes under the hood in order to make the original Sonic closer to the sequels, adding important bug fixes, too! The optional stage palettes simulate the time of day and as it features 3 acts per zone, it’s refreshing to see this change across the acts, the game flows better and there’s a bit more sense of progression with it.

Overall the game is true to the original and the Sonic 2 style spin dash gives it a nice boost. Recommended for veterans as well!

Version 1.1 Recommended - Yes

User Reviews
Recommendedaorin128 Jul 20231.1Yes
A Few Minor IssuesG30FF19 May 20201.1Yes