SEGA is gaming developer and publisher, which rivaled Nintendo during the early 90's with their systems such as the Genesis and the Master System. They have stopped making consoles, instead publishing games on the Wii in recent years, but continue to make Sonic the Hedgehog games.
Working With Nintendo
In 2008, SEGA decided to work with Nintendo on the game Mario and Sonic at the Olympic Games, in which Sonic and his allies challenged Mario and his friends. Also that year, Super Smash Bros. Brawl was released where Sonic was a playable character.
Creating Sonic the Hedgehog
Sonic the Hedghog is the most popular video game that SEGA has released. The creation of Sonic was difficult having to look at the features of a Hedgehog and then later cartooning it. Sonic has released some of the most popular games and was created very similar to Mario.