Only game with AoStH characters?
The opening paragraph contains this sentence: "It is the only Sonic game to feature characters from the Saturday morning cartoon Sonic the Hedgehog and Adventures of Sonic the Hedgehog, though only in cameos." Yet I'm pretty sure Scratch and Grounder were in Robotnik's Mean Bean Machine, and the enemies they were based off were in Sonic 2 (the red Grounders in Aquatic Ruin and the chicken gunners in Wing Fortress)