- Back to: Sonic Chaos (Master System prototype; 1993-06-30).
General comparisons
There is still no opening intro. The title screen immediately appears after the Master System BIOS.
While a title screen has been made for the Game Gear version by this point in development, there hasn't been one made for the Master System version yet, so this build uses a very barebones placeholder title screen that lists both the International and Japanese titles, the version number and build date.
Rolling demos are functional and will begin after waiting on the title screen for a few seconds, but no inputs have been recorded yet, so the demo player just stands there until the demos end.
The Zone Select is enabled by default, and is loaded after pressing any button at the title screen. Like in the 05-30 Game Gear prototype, Turquoise Hill Zone is mispelled as "Turquise".
What's interesting here is that the player can select any of the five Special Stages. Special Stage 5 is off-screen, but it can still be selected.
The background on the Player Select screen does not change colours yet.
Title cards are in, but they have a different colour scheme than the final. The Zone title is also aligned to the right rather than centered, and the Act number is not displayed.
The Continue screen does not display Sonic/Tails. Additionally, both Sonic and Tails start with three Continues each in this build. In the final, only Tails starts with Continues; Sonic doesn't start with any.
Gameplay comparisons
This build also has free movement enabled by holding down 
at any time during gameplay. If the player moves Sonic/Tails through an enemy or hazard using this, they will take damage after letting go of .
Like in the Game Gear prototype, the Bonus Panels always show Sonic before and after they've been spun, and the player still can't earn any bonuses yet. The music stops when the Panel lands on the ground rather than the instant the player touches it.
Sonic/Tails has a trail of stars behind him after the speed has been calculated at the end of Acts 1 and 2. In the final, they only have the star trail in Act 3.
Graphical comparisons
Audio comparisons
The title card jingle has some minor differences, most notably at the end.
Sleeping Egg Zone's theme is a completely different track. Parts of the melody are similar to "I'm About You", a song by synth-pop band The System.
Mecha Green Hill Zone's theme is close to its final composition, but is noticeably unpolished.
Aqua Planet Zone's theme is also completely different, sounding more similar to the theme for Sky High Zone in 8-bit versions of Sonic the Hedgehog 2.
The theme that would be used for Electric Egg Zone Act 3 and the intro is assigned to all three Acts. Compared to the final, the theme is very unpolished and includes a section that would be cut from the final composition.
The Special Stage theme is also completely different, sounding much more happier than the final song.
The boss theme is much lower in pitch, and has a different section before the loop point.
The final boss theme has rougher instrumentation and a different pitch, and adapts the melody of the regular boss theme rather than Turquoise Hill Zone's.
The Invincibility theme is higher in pitch, and loops endlessly, while the final song has an ending (though is never heard in gameplay).
The backing chords for the Rocket Shoes theme is quieter and has a slightly different ending.
The Game Over theme is higher in pitch and has a noticeable "kick" at the beginning. It is also used in this prototype as the death jingle, wheras the final would use a unique jingle adapted from the 8-bit Sonic 2.
The Continue theme is higher in pitch.
The ending theme is lower in pitch, and is missing the final part at the end.
Though currently unused here, the Chaos Emerald jingle is lower in pitch compared to the final.
The unused jingle is higher in pitch and has a shorter ending.
Level comparisons
References
at any time during gameplay. If the player moves Sonic/Tails through an enemy or hazard using this, they will take damage after letting go of 
