Sonic the Hedgehog 3C (prototype 0517)/Hidden content

From Sonic Retro

Back to: Sonic the Hedgehog 3C (prototype 0517).

Level select

SK level select.png

Enabled by default. Scroll down and select "Sound Test" on the title screen.

Edit mode


Enabled by default. Hold A+Start while selecting a level.

All Chaos Emeralds

Play sounds 02, 04, 06, 08 in the sound test. A Chaos Emerald sound will confirm correct entry.

Night mode

Sonic3C0408 MD NightMode.png

Enabled by default. Hold C+Start when selecting a level.

Unused content


Art Offset Description
Sonic3C0517 MD Sprite Dolphin.png
$24028E The dolphin sprites from the good ending, found with the seagull sprites in a KosM archive. The dolphins are mapped to a different palette from the final game, and no suitable match could be found[1].
Sonic3C0517 MD Sprite SuperSonicEnding.png
$240B62 Super/Hyper Sonic's ending pose, found in a KosM archive. Compared to the final, this pose is mapped to the palette used for Super Sonic's ending pose in Sonic the Hedgehog 3 and doesn't cycle. There are also slight differences in the eyes and mouth shape[1].


Sonic the Hedgehog 3C (prototype 0517), prototype version of Sonic the Hedgehog 3
Sonic3 title.png

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Part of Sonic the Hedgehog 3 development