Five Nights at Sonic's Maniac Mania

Inside an arcade machine created by Dr. Golden in 2030, Luigi navigates a horror scenario that includes Lefty Sonic, a nightmare version of himself who can read his mind, and a creature called Nightmaric — a black sonic with tentacles that only appears after clearing all max mode challenges. Completing everything leads to an interview with Dr. Golden. A Five Nights at Freddy's fan game built around Sonic characters and arcade framing.