While the name occasionally appears on "fanon" wikis or as a hypothetical project for other systems like the Nintendo 3DS, no third installment was ever developed or published by Sega.
Fan-Made Mods: The most common "Sonic Rivals 3" files are actually heavily modded versions of Sonic Rivals 2. Talented fans often swap character skins (adding Shadow, Silver, or Metal Sonic variations) and tweak textures to give the game a fresh look. sonic rivals 3 psp cso
This is the most common file you will find when searching for the CSO. It is not a new game but a massive mod of Sonic Rivals 1 . While the name occasionally appears on "fanon" wikis