Board Thread:Questions and Answers/@comment-25348898-20140914173728/@comment-679780-20140927160258

Sonic and NiGHTS have actually met up a few times. Christmas NiGHTS was Sonic's first ever time in 3D. Sonic Shuffle while Sonic and NiGHTS technically never met, NiGHTS page here on our wiki says when Sonic and NiGHTS meet up and shown they have on more occasions than he has with Mario recently.