[From Wikipedia https://en.wikipedia.org/wiki/Sonic_the_Hedgehog_4:_Episode_I]

Sonic the Hedgehog 4: Episode I (ソニック・ザ・ヘッジホッグ4 エピソードI Sonikku za Hejjihoggu Fō: Episōdo Wan?) is a 2010 episodic platform video game in the Sonic the Hedgehog series. The game was developed by Dimps, with assistance from Sonic Team,[7] and published by Sega. The game was intended to emulate the original Sonic the Hedgehog titles on the Sega Genesis.