Sonic the Hedgehog (16-bit) (prototype)/Hidden content

Back to: Sonic the Hedgehog (16-bit) (prototype).

Level select

Enabled by default. Simply press + on the title screen.

Edit mode

Enabled by default. Highlight a Zone in the level select and press and hold .

Unused content

Art

Art	Description
	"U"/magnet block for the Special Stage, located at $651FE.
	Skull block for the Special Stage, located at $6512E.
	Smoke effects, located at $2656E. Their VRAM spot would be overwritten by the Lamp Post in the final.

Objects

Placeable in edit mode

Art	Description
	Static monitor that does nothing when broken.
	The infamous Splats enemy, placeable in Marble Zone. This Badnik is fully coded in this build, and when placed it continually bounces forward, only changing direction when it hits a wall. While it uses Sonic's palette line in the object list, it uses the second palette line when placed. Its object ID is 4F.
	Roller enemies for Spring Yard Zone. They are fully functional, and use the second palette line, making them look purple and yellow.
	Seesaws for Star Light Zone. While fully functional, they don't have the spike ball that helps propel Sonic into the air. Its object ID is 5E.

Others

Art	Description
	The water surface object for Labyrinth Zone. Its object ID is 1B.
	Ball Hog, based on its original front-facing design seen in prerelease material, going unreferenced in the object table. They move from side to side, periodically stopping to drop bombs directly downward. The main Badnik's object ID is 1E, while the bomb's ID is 20.
	Jaws enemies for Labyrinth Zone, which exist in the object table but go unreferenced. They are fully functional. Its object ID is 2C.
	Burrobot enemies for Labyrinth Zone, which exist in the object table but go unreferenced. They are fully functional. Its object ID is 2D.
	The Giant Ring that would transport Sonic to the Special Stage. Its coding is different in that once Sonic touches it, instead of disappearing instantly, he sparkles for a couple of seconds and then "warps" away. The coding is incomplete beyond this point, so Sonic reappears a couple of seconds later. This "warping" code remains unused in the final game. The Giant Ring's object ID is 4B, while the warping effect has an object ID of 4A.

Audio

Music

Audio	Description
	Ending theme; sound ID 8B.
	Final Zone; sound ID 8D.
	Continue screen; sound ID 90. Goes unused in this build as Continues are not implemented yet.
	Staff roll medley; sound ID 91.

Sound effects

Many of the sound effects listed here are unique to this prototype and would be replaced by other sounds in the final.

Audio	Description
	Sound ID A1. Similar to the sound played when exiting a Special Stage. Replaced by the checkpoint sound in the final.
	Sound ID A5. Used by the unused Ball Hog's bombs when they explode. Remains unused in the final.
	Sound ID A8. This sound effect is used by the unused warping effect in this build. Replaced by the aforementioned Special Stage exit sound in the final.
	Sound ID A9. A longer, higher-pitched rolling sound. Replaced by the sound for the speed/Reverse blocks in the Special Stage in the final.
	Sound ID AA. The splashing sound for entering water; unused as there is no water yet.
	Sound ID AD. A duplicate of the Badnik/monitor explosion sound. Replaced by the sound for breathing in an air bubble.
	Sound ID B0. A low-pitched siren sound that loops endlessly. Replaced by the buzzsaw sound effect.
	Sound ID B1. A higher-pitched Pac-Man-esque siren that also loops. Replaced by the sound for Scrap Brain Zone's electrical hazards.
	Sound ID B2. Some sort of buzzer sound. Replaced by the sound played when Sonic drowns.
	Sound ID B3. A rough sound effect that quickly rises and falls in pitch. Replaced by the sound for Scrap Brain Zone's flamethrowers.
	Sound ID B8. Similar to the spike sound. Remains unused in the final.
	Sound ID BA. Sounds similar to the sound used by the drop targets in Sonic 2's Casino Night Zone. Replaced by the sound for hitting the diamonds in the Special Stage.
	Sound ID BB. The sound used for the Labyrinth Zone doors and Scrap Brain Zone trapfloors; unused as those objects don't exist yet.
	Sound ID BC. The sound used for the transport tubes in Scrap Brain Zone; unused as they don't function yet.
	Sound ID BF. Two quick, harsh-sounding notes that loop indefinitely. Replaced by the Continue sound.
	Sound ID C2. An alternate version of the Badnik/monitor destroying sound. Replaced by the underwater warning bell.
	Sound ID C3. A deeper version of the bomb explosion sound heard in the next sound ID slot. Replaced by the sound for entering a Giant Ring.
	Sound ID C9. A harsh, vibrating sound effect. Replaced by the sound for finding a hidden point bonus at the end of an Act.
	Sound ID CA. Sounds like footsteps walking away. Replaced by the sound played when warping to the Special Stage.
	Sound ID D1. A louder version of the Green Hill Zone waterfall sounds. Cannot be played in the sound test, and completely removed in the final.
	Sound ID D2. A strange rhythmic pounding sound that loops endlessly. Cannot be played in the sound test, and completely removed in the final.
	Sound ID D3. A fiery noise that progressively oscillates, looping endlessly. Cannot be played in the sound test, and completely removed in the final.