I made a few Sonic-related web apps over the last year that I'd like to share with you guys to receive your input. Sonic 3 Save Editor Sonic 3 Save Editor (source code) I made this last September and posted it to Reddit to thunderous reception. As far as I know, it's the only editor implements the checksum algorithm used by the original game and works with original emulator saves. It can also do goofy things like enabling "Blue Knuckles" or assigning Death Egg Zone to Knuckles if you check "Show advanced options" (which reveals some extra save options as well). Based on Xfox Prower's format specification for the PC version. It originally only supported emulator saves, but I recently added support for the 1997 Sonic & Knuckles Collection, the 2011 Steam re-release, and Sonic 3 AIR. If anybody comes across a valid save that can't be opened in the editor or a save generated by the editor that can't be opened in one of the supported versions of Sonic 3, please post it here. (Edit: I recently reworked the Sonic 3 AIR part of the editor to work on persistentdata.bin rather than sram.bin. This lets it edit competition mode times as well. It's possible that this approach will unknowingly overwrite some data I don't know about (though I think it's probably fine, since achievement and non-competition time attack data are stored in other files), so, you know, use backups and let me know if it screws anything up.) Sonic CD Save Editor Sonic CD Save Editor (source code) I made this last week. It only supports emulator saves for the original Sega CD game. I've tested it in Gens and Kega Fusion, and it seems to work alright. I realize the original release is probably the least popular version of the game these days, so I don't expect that this will draw much interest. I do hope to add support for the 2011 Retro Engine release eventually. I'd also like to support the 1996 Sega PC release (for the sake of consistency with the Sonic 3 editor's support), but its save format looks completely inscrutable to me (maybe it's compressed?). If anybody knows of a resource that demystifies it any, please let me know (though, again, I understand that there probably isn't a ton of interest in the Windows 95 version of this game). Tails Adventure Password Generator Tails Adventure Password Generator (source code) Oh, and I made this thing too, last November. It's based on Xfox Prower's password generator (which, like his S3&KC save editor, doesn't work in modern browsers anymore without some modification). It always generates the same password as Xfox Prower's generator, which, in my testing, is usually but not always a valid password. There isn't a nice disassembly of this game like Sonic 3, and I couldn't work out the password algorithm any better with a debugger, so this is probably as good as this will get unless somebody has some additional insight to share.