From the realm of “I’m surprised this hasn’t happened already” comes a handy and amazing editor from one of our new tech members, Flamewing. The “Sonic 2 Special Stage” editor is the first known program to allow manipulation of the special stages from Sonic 2. The editor is cross-platform and allows you to edit the following:
However, when editing Special Stages, you cannot edit the background, palette or ring requirements. If you want to manipulate those things, you need to edit the disassembly itself. Yes, you need to use a split disassembly and not a straight-up Sonic 2 ROM.
I can’t wait for “Sonic 2 Special Stage Attack” ROM hacks to start popping up.