over 40.9 million [ s 1 ] Media ROM cartridge CPU 68000 and Z80 Online services Sega Meganet , Sega Channel , XBAND Best-selling game Sonic the Hedgehog ( pack-in ), 15 million [ 8 ] Sonic the Hedgehog 2 ( pack-in ), 6 million [ 9 ] Aladdin , 4 million [