Sonic's Lost World Adventure ... Galaxy?

The best parts of Sonic Adventure were the parts that weren't like other Sonic games -- well, not that the treasure hunting was any good, but: the open-world exploration, and mixed-up mechanics like E-102 Gamma's shooting galleries, gave Sonic all new flavors that really enhanced the experience.

Which is why it's such a tragic comedy that only now, 15 years later, Sonic Lost World is finally lessening the focus on Sonic's speediness, in favor of thoughtful level design. Whether they can do it well is yet to be determined, but the attempt, at least, is encouraging.