It's all there in the Sonic 2 manual, but when does anyone, let alone 5-6 year olds, read manuals anyway?
GameTrailers gave Sonic Colors the lowest score yet, a 6.4/10, which by scoring standards is still good. But the score was so far out in left field compared to the other scores that various sources are actually calling bull on the score, claiming that GameTrailers was playing a beta of the game and made a mistake; Go Nintendo is looking into it. It says a lot about the game to have sources go out and look into it for giving the game an average score.
EuroGamer was also a surprise. IIRC, they gave the acclaimed God Of War 3 a 7/10? They gave Sonic Colors 9/10.
Famitsu gave Colors 34/40 for the Wii, and the DS port 32/40.
So, in total, we have GameTrailers's 6.4, a few 7s here and there, a ton of 8s, and some 9s. Sweet deal.