User blog comment:Rose Wolf/Sonic's 21st Birthday!/@comment-4533965-20120814185500/@comment-3000576-20120814214044

If you think about it, Colors is a quasi-sequel to Unleashed, while Generations is the same to Colors:


 * All three use two different styles of gameplay (Werehog, Wisp, Classic)


 * All three somewhat involve space (the beginning of Unleashed, Colors in general, the distortion of time and space)


 * All three use boost and similar gameplay, with Unleashed starting the style.


 * All three have been ported to lesser consoles (Unleashed to WiiberrynokiaS2, Colors to DS, and Generations to 3DS).