Sonic 1 Co-op
By Undying_Star
(This Rom Hack is strictly Multiplayer, it can be played Online via Parsec or Kega netplay. It's recommended to play on Kega for the BEST Splitscreen viewing pleasure)
From the creators of Sonic 2 Co-op from SHC 2023, we've taken your feedback to heart and crafted a completely new multiplayer Sonic 1 ROM hack to the best of our abilities.
We've heavily optimized our engine to offer the best performance we can provide whether you're working together or competing with a buddy.
Work together to save the day or compete for triumph as you bring the fight to Dr. Robotnik!
(To skip the intro both players must be pressing start at the same time)
Compatability With Real Hardware:
- Hasn't been thoroughly Tested.
Modes
- Co-op Multiplayer – Join forces and obliterate Dr. Robotnik hand to hand!
Features:
- Engine rewritten from the ground up for smoother split-screen performance
- Compatible with real hardware, AtGames Firecore with music-patched and overclocking-enabled support for better performance.
- Supports Sonic & Knuckles lock-on port for a suprise
- Remastered soundtrack and custom day/night cycle to offer visual and audio variety
- Brand new palettes that breathe new life into each zone
Gameplay Changes:
- Players Hurt Eachother: Jump on top of each other to attack!
- Speed Bump Launch: Charge into your opponent and knock them over with your speed!
- Sonic Can Drop Dash and Tails can Fly!
- Flight Unassist: Drop Sonic whenever you feel like!
Co-op Mode additions:
- Unique Act Remixes
- Modified Object Layouts tailored for cooperative play
- Day And Night cycles
- Doubled Hit points for Robotnik
Creator: Undying_Star
Programmers: Malachi, Jdpense, Undying_Star, Hame, DarkShamilKhan
Sound Programmers: DaxKatter, ProjectFM, Undying_Star, DarkShamilKhan
Composers: Stealthy, DarkShamilKhan, DaxKatter, Matt, ChiliHog, Chron Delta, ProjectFM
Artists: Stealthy, Stick Nick Productions
Rock Stars: Malachi, Jdpense, Stealthy, DaxKatter
Special Thanks: E-122-Psi, MarkeyJester, Giovanni, Sergeant16bit
Play Testing: Bananu0943
File Type: rom/mega-drive
File Size: 2 MB
gonna reserve this reply, if y'all don't mind
Lol, great work. I've been waiting for nearly 3 years.. And its finally here! Thanks.
I decided to play this from Start to Finish alone, but I'm glad I chose to, with all the enhancements this hack brings, like the new really well made music remixes and the stage palettes changing within the stage, it was really great to play through, though alone so I didn't really get the full experience. Though there was one small thibg in the boss fights that made them less fun, which I assume is a big, is that can't spin-dash on objects, which are the platforms in Green Hill, the floor in Spring Yard,
the seesaws in Starlight and the pistons in Final Zone. I also like the modified art for the foreground and background for Labyrinth Zone, though I do wish SBZ 3 had new art as-well. Also, I don't know if this is do with my emulator but the final cutscene panel is broken. But overall, the hack was really great and worth playing, even if I chose to not get the true experience by playing alone instead of with someone else.
Thanks for playing! I'm glad your lack of available friends didn't deminish the experience too much.
Regarding those bugs, I found the culprits for them shortly after the SHC deadline so they'll be patched in later releases. That boss anim spindash prevention bug annoyed the hell outta me when debugging the game, so you're far from alone on that; it also caused a bigger issue with retained inertia
0/10 i have no friends and that's you're problem
The thing of is the scene being glitched in last.
You need to have SRAM or at least level select in Sonic 1 Co-op since it makes it awful if you don't use save states.
at the very least i think i could have went with SRAM, but SRAM was delegated for player recording among other things so.. i didn't wanna risk it since near deadline.
Peak.
I was waiting for this
played this with matt in shc discord server and its peak i love it so much
also the secret drive link from the lock on doesnt even work i tried several times and i get nothing
Last modified by SaturnDreemurr32X @ 2025-10-06 08:35:47
That's weird... it does work on my end, maybe you wrote it wrong.
0;/10 because i got not bitches to play with jk its cool
Any chance for a level select code or some way to access the sound test/music? I want to listen to the tracks in this on my own time, but the lack of any nice way to rip or listen to it is tough...
yes there is a sound test code, however due to strict deadline we couldn't include the level select in a stable environment. Sound Test code is Up, Down, Down, Down, Up and hold C and Start
0/10 i don't have irl friends that likes sonic.
jokes aside tho, the rom hack is actually very great, like art and other stuff.
I will be pushing a HotFix next week to adress many issues with the hack
Last modified by Undying_Star @ 2025-10-04 16:43:46