A working solution exists. The most reliable, actively maintained infinite rings mod is bundled inside larger utility mods or via a dedicated script known as "Endless Rings" or "Ring Manager Plus."
: In some versions, if you have both Sonic and Tails on-screen, you can use Debug Mode to place a ring directly onto Tails repeatedly to gain up to 900 rings. Installing Mods for Sonic 3 A.I.R. sonic 3 air mod infinite rings work
: Place your downloaded mod folder (extracted from its .zip) directly into this directory. A working solution exists