names are for friends
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Imo the levels are less interesting than Generations. There's less divergence in the tracks and more levels that flat-out suck (the arctic level, ugh). That said, while I played through all the boost games sequentially about half a year ago and I definitely remember Generations being a huge step up in level design, but I think I'd need to play them again now to have a more specific criticism...They are, by far, the best designed levels in any 3D Sonic game.
(What hit me most actually when I replayed them all was how unfun Colours is. A lot of reliance on janky 2D platforming sections with awful controls that make simple maneuvers overly difficult.)