Really simple mod that swaps all the classic and modern acts so classic sonic(and modern sonic) can play in each other's acts. This mod modifies the levels' layouts so classic sonic can complete all 9 modern acts. Anyone with the tools and notepad editing skills can do this mod, but I'm releasing it on a simple to use installer.
WARNINGS READ THIS:
- Don't spindash in 3D unless you already spindashed once in 2D mode. It's glitchy though. It'll boost you in the direction where you spindashed last time in 2D.
Make sure you unlocked the homing attack in the regular game. You won't be able to get all the red rings in Planet Wisp with this mod, and you'll really need the skill for post-Genesis era levels.
Don't use Spike Wisp if there are any springs around added so you can get through. They're there for a reason. (Hint: Crashes)
CSA now with SonicGMI support(6 MB)
Special thanks to Korama for converting the mod to be compatible with the newest version of CPKREDIR!
You'll need SonicGMI installed for playing this mod. Simply drop the "CSA" folder into the mods folder you have from SonicGMI, then boot up and check the box for SonicGMI. That's all that needs to be done! No backups required.
Green Hill Zone
Chemical Plant Zone
Sky Sanctuary Zone (<- Really nice level for classic)
Feel free to report any non-obvious bugs here like impossible paths for classic sonic, or obscure objects that make him crash.
Modern sonic can play on Classic's levels, but their layouts aren't fixed, so it'll probably crash in some levels like Planet Wisp, Rooftop run, and Seaside Hill.
I know this mod is simple and anyone could do it with just a bit of patience, but most regular users aren't interested in the technical mumbo-jumbo and would prefer an installer like this one.