Thanks to the science of hacking, sprites and tiles that are hidden in the prototype ROM file can be recovered. Note that some palettes may be incorrect!
|Sprite/Tile||Nicknames||Hex Address||Discovered By|
|Spring monitor||?||<Too long ago>|
|It's rumored that this would attach a spring under Sonic's shoes, like in Sonic Triple Trouble.|
|Bubbler's Mother, Three-eyed Fish, Tri-eye, Blinky||$7C0C6||Esrael|
|This multi-eyed creature would drop Bubbler onto the ground in Chemical Plant Zone, as illustrated by the concept art.|
|This lump of bubbles would appear in Chemical Plant Zone and burst when Sonic is near. According to concept art, it is supposed to be purple in color. This enemy would be dropped by Bubbler's Mother.|
|The seahorses shoot oil balls at Sonic when approached. Their behavior can be seen in Esrael's hack, Sonic 2 Delta.|
|This is not your usual octopus seen in OOZ. When it sees Sonic, it fires a glowing bullet and then quickly flies away horizontally. Again, this can be seen in Esrael's hack. The palette shown here is wrong—the octopus looks pink, as usual, under OOZ's palette.|
|Lamppost, Restart point||$79278||<viewable via debug>|
|Fireball, Log on fire||$7436C||Nemesis|
|Possibly part of a burning bridge after destroyed by yet another scrapped enemy, the Bee.
"I'm not entirely sure if this is a fireball or a burning log. The main area in the center that's black uses the second colour on the palette line, which is a dull colour on every palette in the beta, rather than an intense red that you would expect." ― Nemesis
|This ball is believed to supposedly bounce and crush Sonic.|
|HPZ alpha background backdrop||$2B06A||BMF54123|
|EveryNameWasTaken noticed this thing matches with the holes in the background of the mock-up Hidden Palace picture. Click here for more info.|
|Drill, Rotating screw||$2A86A||Dr. Ivo|
|Splashing rock||$4B76C||Dr. Ivo|
|Flame anchored on brick wall||$4E86A||Dr. Ivo|
|"You know that one with the fire in the pot against the stone wall? That actually wasn't compiled in our version of the rom, but is merely left over from a previous build." ― Nemesis, ROM Hacker @ Area 51 phpBB (defunct)
These two tiles do not belong to a Sonic game. Click here for more info.
|Lost CPZ Boss, Splattered Robotnik||$7D3DA||Knuckles Prower|
|It's possible that this sprite would be displayed when Robotnik is hit or defeated in CPZ.|
|Sonic ledge animation||?||?|
|Sonic sitting down, rotating, and pulling||?||Scott Prower|
|The sitting down sprites were later discovered to be remnants of a scrapped "bounce back after running into the wall" animation fully used in the Nick Arcade prototype.|
While it's quick to browse through the list of pictures, remember these discoveries are made possible by hackers who spent hours and hours to dissect and study the ROM image. My thanks go to everybody in the Sonic Hacking scene.