- A second player
- Elemental Shields
(Note: P2 doesn't collid with other objects yet.)
Screenshot :V
Credits:
- Those who made this page on Retro: http://info.sonicretro.org/SCHG:Sonic_the_Hedgehog/RAM_Editing
- Shobiz for the Spindash guide part 3 (only the "Converting Sonic's art buffer to a DMA queue" part for the shields' art)
- Hivebrain for the S1 split dissambley
Download: http://www.mediafire.com/download/ucn40p92xvqu1mm/S1+Coop+Test.bin