Sonic Mega Collection (Prototype - Aug 15, 2002) ().Sonic Mega Collection is a video game compilation developed by Sonic Team and published by Sega in 2002 for the GameCube. This seems to affect a bug where Oil Ocean Zone's music can still play even when the game has returned from the level select screen after inputting a certain cheat. This changes a piece of code at 0x9792 from 'move.b #$3F,d0' to 'move.b #$BF,d0'. However, the retail version of Sonic Mega Collection uses a new REV01 ROM where the only differences are a recalculated checksum and a single byte change at 0x9795 (0x3F was changed to 0xBF in Sonic Mega Collection). Sonic the Hedgehog 2 in this version uses a ROM that's byte for byte identical to what is used in the original REV01 release of the game.'knu_p1_us' however is a copy of the ROM that contains a XOR'd message in the memo section of the header that writes 'SEGA CHANNEL'. 'knu_p1' is used in this version and is also byte for byte identical to what is used in the retail version. This prototype contains two copies of Blue Spheres (Sonic & Knuckles + Sonic 1), 'knu_p1_us' and 'knu_p1'.In the final, this was changed to use the final ROM with the original theme by Howard Drossin. The ROM used for Sonic Spinball is a scene release of a very late prototype, with the Sonic 1/2 main theme on the title screen.This build contains leftovers for Sonic CD, but it doesn't physically exist on the disc.The build contains leftovers for Choro Q on the disc for some reason.

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