Sonic the Hedgehog 2 (ソニック・ザ・ヘッジホッグ２ Sonikku za Hejjihoggu Tsū?) is a 2D platforming game in the Sonic the Hedgehog series developed by Aspect and released by Sega. The game is released in-between October and November 1992 for Sega Master System and Game Gear. Predating its 16-bit counterpart for the Sega Genesis by less of a month, the game marks the debut of Miles "Tails" Prower, Sonic the Hedgehog's best friend who would become one of main characters in the series.