I'll add a DLE to resize the level bounds in that area That was intentionally going backwards. I can look into making a proper looping remix of the song (although I suck at composing original music) Do you remember which type of error code was generated? Please take a screenshot of it if you can replicate it, so I can look into fixing it. There is a dead end area near the lower path in the beginning of the stage; only the Bonus Stage door can take you out of it. The level past that I can revise the level layout (the door in the next area is a warp door and takes you to the boss area). I can also add code to apply a different palette to distinguish between bonus and warp doors. I'm keeping the Kirby Minecart song, that level is mostly a mine cart riding level anyways. In the original Socket game, that particular loop acts like that. However, I am looking into modifying Sonic 1's loop system to handle properly the Big Rom Chunk feature that replaced it (some later HSZ acts appear to have proper Sonic 1-styled loops in Socket). That is Future Zone that is inaccessible through the Level Select; it was disabled in the menu for the v0.3 demo as the level was in-progress during build. Thanks for the feedback!