The PSP Sonic titles have mainly been forgotten to time, yet surprisingly relevant in a few ways. Jakks Pacific toys have made Metal Sonic 3.0 figure, which is a character that only appears in this game.
I feel SEGA forgets that a lot of kids at this time only had a handheld - so Rivals, as not great as it is, was a lot of kids first Sonic game. Rush on the DS was certainly better, but it's just interesting how they're handled.
https://drive.google.com/open?id=1yh6L4XZn7NgbGrtEKoAayTnA1GVnnK3p&usp=drive_fs