Years and years ago, I copy-pasted the Sonic Retro page on Blast Prototype 611, and now I am trying to figure out if anything else is in the build. However, while experimenting around with RAM values in the final, I came across the value that handles what song to play when starting a level, $D13E. Using this, I was able to document all of the music IDs, with valid entries up to $98. Notably, Green Hill Zone is the first song internally, followed by most of the generic themes and then the rest of the stages, which makes sense since Blast 611 just boots you into GHZ without any title screen. But what really got my attention were IDs $92 and $97, both of which are short themes that would seem fitting for speed shoes and invincibility respectively. Now, I don't play Blast personally (not that I know anyone who would willingly), however I don't remember either of those things being here in this game, and YouTube uploads of the entire soundtrack completely lacks these. $98 is also taken up by a sped-up title theme, which I also don't remember getting used. To anyone with more experience with Blast, try correcting me if I am wrong and these are used. Here's the full list of songs in order: 81 - Green Hill Zone 82 - Character Select 83 - Boss Theme 84 - Title Screen 85 - Level Complete 86 - Title Card 87 - Yellow Desert 88 - Red Volcano 89 - Blue Marine 8A - Extra Life 8B - Silver Castle 8C - Opening Theme (VERY cut-off in-game, follows the structure of Triple Trouble's) 8D - Continue? 8E - Game Over 8F - Dead 90 - Final Boss 91 - Special Stage 92 - Unused A 93 - Credits 94 - Ending 95 - Boss Defeated 96 - BLANK 97 - Unused B 98 - Unused C Ironically, this DOESN'T work in the prototype, however the value that handles which character you play as ($D133) does; forcing it to 1 (Knuckles) just crashes the game, however, which makes sense as you can't even play as him and he likely wasn't implemented yet.