![]() ![]() The player can not change the direction while roll-jumping, like in the other Mega Drive / Sega Genesis Sonic games.Collecting 50 rings does not spawn a Special Stage ring at the end of a level, as it is unimplemented.That player will then able to control that Sonic. Pressing Start on the second controller spawns a second Sonic.Clock: Meant to freeze time for a few seconds, but is incomplete, as it only freezes the animation of objects other than Sonic.In later builds it acts like a triple-layered shield (as-in, it gives three additional hits), but was later removed from levels. Blue Ring: When broken, Sonic will run faster and be granted temporary invincibility.Two additional item monitors are present in this build.The game cannot be paused, and no code to pause the game exists yet.Collision Chaos' Present theme is used here instead of the actual Time Attack music.All other known versions of the game jump from R1 (Palmtree Panic) directly to R3 (Collision Chaos). This is the only prototype that explicitly references Dubious Depths, the scrapped second round (R2), which is listed as a level entry in the Time Attack menu.These entries don't have proper level loading command IDs defined, resulting in either a crash or loading an R1 level with the selected level's ID and time zone (which causes certain zone dependent things to switch on or off, and also affects which song plays during the level). Only Palmtree Panic Zones 1/2 are normally selectable, and is referred to as "Salad Plain." Although by hex editing values on the Time Attack menu, it is possible to bypass the restrictions of being stuck with R1-1 and R1-2 and you can select other levels, although there are no other Zone previews on the left when going beyond Salad Plain.The palm trees have a more asymmetrical design.This early background is the basis for the other time zones' backgrounds, which were unchanged in the final game. The Present has a different background, notably shorter and less geometric mountains.To access the Good Future variants of the levels, set 0xFF127A in RAM to 1, or change bytes at 0xA1A in the Track 1 binary to 0070 for Zone 1, and 0058 for Zone 2.However, the level files for Good Future are present, alongside the flag that sets them as accessible. It's not possible to get a Good Future in this build.The color palette has slight differences, and the palette data and palette cycling data are still in the final game. ![]() Palmtree Panic was originally called Salad Plain, according to the Time Attack screen (see next section below). The song itself also plays here, instead of the opening cutscene. A text string at corner right credits Japanese singer Keiko Utoku of contemporary pop-idol group Mi-Ke for the opening theme song, "Sonic - You Can Do Anything", for press purposes. ![]() 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 has 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.
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