Sonic The Hedgehog 3.
Duke Nukem & Sonic Adventure.
Sonic The Hedgehog.
Sonic Adventure 2.
Update: Despite what the evidence suggested, Jaleel has just gone on record saying he was not approached by SEGA to voice Sonic.
Video interview where SEGA employee Aaron Webber states it was “either Jaleel or no voice at all”.
Article where Stephen Totilo states (after talking to Webber about Sonic Generations) “Sega couldn’t get him [Jaleel White].”
Sonic Adventure and PaRappa the Rapper.
Sonic the Hedgehog 3.
Found another site saying the crescent was inspired by the Nike logo: http://bit.ly/ZZSDLU