There are two distinct versions of SonicUnleashed – the primary version, released for the Xbox 360 and PlayStation 3, and a somewhat cut-down version created for the Wii and PS2. Both of them tell the same story and feature the same gameplay styles, but there are a number of key differences between them. The HD versions have full 3D town environments to explore between action stages, and require you to collect sun and moon medals to unlock additional stages. Additionally, an experience system allows you to level up Sonic in both his regular form and the Werehog.