Sonic Statistics

Sales:
Many games in the series have been commercially successful. As of 2010, the series has collectively sold over 70 million units worldwide. Sonic the Hedgehog 2 for the Genesis and Sonic Adventure for the Dreamcast are the best-selling games for their respective platforms.

Reception and Legacy:
The Sonic the Hedgehog franchise was awarded seven records by Guinness World Records in Guinness World Records: Gamer's Edition 2008. The records include "Best Selling Game on Sega Systems", "Longest Running Comic Based on a Video Game" and "Best Selling Retro Game Compilation" (for Sonic Mega Collection). In the Guinness World Records: Gamer's Edition 2010, the Sonic the Hedgehog series was listed number 15 out of the top 50 video game franchises. In December 2006, IGN ranked Sonic the Hedgehog as the 19th greatest series of all time, claiming that "although recent 3D entries in the series have been somewhat lacking, there is no denying the power of this franchise."
A common criticism has been that the variant gameplay styles found in recent 3D titles have strayed from the formula of the original series. Specifically, the series' jump to 3D has been noted as a declining point. Many sources pin-point 2003's Sonic Heroes as the beginning of the series' decline. In late 2010, Sega delisted several below average Sonic titles, such as the poorly received "Next-Gen" Sonic the Hedgehog, in order to increase the value of the Sonic brand after very positive reviews for the games Sonic the Hedgehog 4 and Sonic Colors.