@SketchAnimations and @auroraknux: I can't really rip anything other than the general sprites, mainly because Retrun doesn't have an extraction format for Sonic 2. There are some files that share the same locations and names so it can extract those. It'd be very difficult to rip any zone tiles, maybe not the sprites, but the fact that each tile is stacked on top of each other, that'll be a problem. :(

I've gotta start looking up a new RSDK extractor. I've had dumb luck with opening .iso and similar file types with a zip extractor, but I've of course tried it with the data file and it won't budge. The one I'm using, which only supports Sonic 1 and Sonic CD, can decompile and recompile the RSDK file, assuming it's using one of two file formats.

Also, if Mania uses the Retro Engine when it's released, I'm gonna get going on ripping sprites ASAP!

its mostly the same except menus and hidden palace restoration, we need the boss

@Dolphman did rip the HPZ Badniks and shared them on DeviantArt, along with remade versions of the concept Badniks. You can see them here.

I second SketchAnimations' comment; can someone rip Hidden Palace Zone?

Is it possible for someone to rip the new Hidden Palace Sprites?