- Back to: Sonic the Hedgehog CD (prototype 510).
General comparisons
The 510 prototype has a Sega screen, complete with classic jingle. This was removed from the final, likely as the Mega-CD BIOS already does the work in this regard.
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510 prototype
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The title screen was overhauled for the final game. In the 510 prototype, "CD Sonic the Hedgehog" uses a 320x224 screen resolution (versus 256x224) and lacks the scaling cloud effects. There is also no introductory animation, just a simple fade in.
The animated introduction has a different border, with the text "開発画面" (Kaihatsu Gamen, which literally translates to "development screen"). It also runs slower than the final game.
A scene involving the Eggman mountain does not exist yet, and is also absent from the PC port of the game.
This scene pans up towards Little Planet from the chain. In the final game, it is reversed, panning down instead.
The time attack mode uses a different "exit" icon than the final game, showing Little Planet rather than Sonic. The game again refers to itself as CD Sonic the Hedgehog. The default times are also set to 12 minutes rather than 15.
The title cards also read CD Sonic the Hedgehog, and the life counter in the HUD is misaligned.
Graphics comparisons
Level comparisons
References