Sega introduced the Sega CD and 32X add-ons for the Genesis, which sparked the idea ... beyond the lack of Sonic the Hedgehog ...

The 1991 release of the original Sonic the Hedgehog, not to mention an exceptionally well-timed price drop, actually put the Genesis ... of its new CD-based console, the Sega Saturn, earlier ...

1 Billboard hit, and Sony's Disk-Jockey CD player was selling ... The boom in sales came when Sega decided to drop the price of the Genesis and include a copy of Sonic with new purchases.