Little Planet in the background is more washed out with some dithering.The clouds scroll from left to right, instead of using the Sega CD's graphics processor to render them scrolling towards the front.Given that this process has some bandwidth limitations, and that the Special Stage runs at the same resolution and framerate, it is likely that this accounts for the resolution drop in the final's title screen. All of the perspective effects in Sonic CD are calculated by a co-processor on the Sega CD, which produces tiles that have to be transferred to Genesis VRAM to be displayed.The prototype's title screen is 320×224 at 60FPS, but was later changed to 256×224 at 20FPS.A gold emblem with the Sega logo and the copyright date (1993) is present, but was removed from the final version.The game's title is CD Sonic the Hedgehog, rather than Sonic the Hedgehog CD.The title screen has several early elements that would be changed from v0.51 onward: An extra SEGA logo screen is present at the start, complete with classic "Se-ga!" jingle. This is also the only known prototype that acknowledges the infamous " R2", which is present in the Time Attack screen, and is selectable by using a hex editor but is not functional.Īt this stage, the game calls itself CD Sonic the Hedgehog in English an odd touch considering that the Japanese spelling does put the "CD" at the end of the name. In terms of gameplay, only Acts 1 and 2 of Palmtree Panic are present in the build (though Collision Chaos and Quartz Quadrant do have leftover stage data). Much of the game isn't implemented, or is buggy at best. It was dumped by drx on October 26th, 2019 as part of Hidden Palace's "Sonic Month." The build is dated December 4th, 1992 (nine months and two days before final), predating the previously discovered 510 prototype, and was created for exhibition at the "Yuusei Sega World" event in Japan that year. V0.02 is the earliest known prototype of Sonic CD for the Sega CD. Layout differences in Palmtree Panic/Salad Plain, plus any potential unused sprites in the proto.
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