This is essentially a Sonic Adventure game with only Sonic/Shadow levels. Which is what I've wanted out of the series for the longest time. And... it's great! The combat felt a little superfluous, but it's pretty good. The story is also kind of silly, but it's the fun kind. As for the levels they're all large, befitting Spark's speed and have multiple pathways and plenty of areas to explore. The music is pretty good too. Definitely recommend for any Sonic Adventure fans.