Give me "Video Games" for 500

This is Sonic the Hedgehog's genre

...

Don't worry, I couldn't answer it either

Well, back in the old days, Sonic was a platformer. Then, with the release of Sonic adventure, it became an adventure game. Next, Shadow the Hedgehog was a TPS. Don't forget Sonic Riders, a racing game. And now, with Sonic and the Secret Rings, It's an RPG at high speed. Stick to a genre already.