Sonic Rush Adventure preview at 1-up.

"Sonic isn't usually the type to slow down for anything (and he's sped through his share of less than stellar games on a number of systems). His latest handheld outting Sonic Rush Adventure has plenty of old-school 2D missions as well as some interesting 3D sea-faring stages and a few moments of RPG-like storytelling."

Full Source: 1-up