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S1Fixed Beta

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What is S1Fixed Beta?

SEGA Genesis
Platformer
Beta
5· 0 votes

S1Fixed Beta is a fan-made modification of the original Sonic the Hedgehog for the SEGA Genesis, specifically a beta build intended to address bugs and glitches present in the base game. It was created by RetroKoH and released as a free patch, not an official commercial title. This is a classic platformer built on the same engine as Sonic 1, keeping the blue blur's signature speed and loop-de-loop stages. Players control Sonic as he dashes through Green Hill Zone, Marble Zone, and other familiar acts, collecting rings and defeating Badniks. The core loop remains unchanged: reach the end of each level by jumping between platforms, rolling into enemies, and hitting checkpoints. What sets this version apart are targeted fixes - such as patched collision detection or corrected level tile behavior - though exact changes are not fully documented in this beta. The game plays identically to the original outside of those tweaks. For Sonic fans who have played the original to death, S1Fixed Beta offers a cleaned-up experience that removes some of the rough edges that have been known for decades. It is not a full overhaul, so do not expect new levels or features. If you enjoy seeing classic games polished by the modding community, this is worth a quick playthrough. Just keep in mind it is labeled beta, so some fixes may be incomplete.

GAME INFO

Platform: SEGA Genesis
Genre: Platformer
Players: 1
Version: Beta
Based on: Sonic the Hedgehog
Made by: RetroKoH

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How to play S1Fixed Beta online

Getting Started

Start the game, and you will be greeted by the title screen. Press Enter to start a new game. You play as Sonic in Green Hill Zone, the first level. Your goal is to reach the end of each act by moving right, jumping over pits, and defeating enemies (Badniks) by rolling into them while spinning. Collect rings to protect yourself from damage - if you get hit while carrying rings, they scatter and you must recollect them before they disappear. If hit with zero rings, you lose a life.

The core loop is simple: run through each zone, collect rings and power-ups like speed shoes and invincibility, avoid spikes and bottomless pits, and hit the signpost at the end of each act to progress. After finishing all three acts of a zone (plus a bonus stage between acts), you move to the next zone. S1Fixed Beta follows the exact same structure as the original Sonic 1, so anyone who has played the classic will feel right at home. Since this is a beta build, do not be surprised if some fixes are not fully implemented - report bugs to the author if you encounter them.

CONTROLS

Controls

Arrow Keys: D-Pad / Movement
X: A button
S: B button
Z: C button
A: X button (6-button pad)
Q: Y button (6-button pad)
E: Z button (6-button pad)
Enter: Start / Mode

S1Fixed Beta FAQ

Can players save progress in S1Fixed Beta?

S1Fixed Beta does not include any save feature, as the original Sonic the Hedgehog relied on level select codes after completing the game. Like the base game, you must finish all acts in one sitting or use a state save through your emulator.

Is S1Fixed Beta exclusive to SEGA Genesis or did it appear on other systems?

This mod was created exclusively for the SEGA Genesis / Mega Drive. It is a ROM hack intended to be run on original hardware via a flash cart or on emulators. It has not been ported to other platforms.

In what year was S1Fixed Beta originally released?

The exact release year is not widely documented. The project appears to have been developed in the late 2010s or early 2020s, but no official date is available.

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