Sonic Generations for 3DS was probably the weirdest Sonic game I played outside of 06. It features levels different from the console versions-Mushroom Hill and Radical Highway, for example-no cutscenes, no side quest missions, no Super Sonic except for the end fight, and for whatever reason they gave Classic Sonic a homing attack. Not an unenjoyable game by any means-but an odd tidbit of Sonic history.
Chances are your locals don't have any offenders, but if they do, report them to the TO and they should ban them. In case the TO refuses to, you should probably switch to a different local.