Xbox World 360 via CVG writes: "Sonic Unleashed is a game with a dark side. By day it's a screamingly fast revival of the exhilarating, colourful, rollercoaster gameplay that made Sonic such a blast in the early 90s. But at night, Fun Sonic goes to bed and his slow, grumpy, uncontrollable alter-ego makes a thoroughly unwelcome appearance.
The two Sonics clash so jarringly, they seem almost like two different games mashed forcibly and unnecessarily together. Normal Sonic is inventive, exciting and sometimes spectacular, but you've got to put up with some absolute rubbish before you get to play him."