You’d expect long-term Sonic fans to get some deep references into Sonic Mania, but maybe the deepest of all is the tribute to the Sonic Retro user Polygon Jim, who passed away in 2013. Heavy Rider’s steed Jimmy is a jumping Motobug, similar to the one in Polygon Jim’s Motobug In Sonic 1 ROM hack. Few will recognise it, but it means so much to the people who understand.