The toys within the playfield are amazing, with magnets, trapdoors, a “Quantum Theatre” which adds visuals and also functions as other toys that aren’t bodily there, form of like virtual pinball. Huge Activity is usually a 1980 pinball machine made by Stern Electronics, Inc. and designed by Harry Williams. http://pinballcop.com/product/black-knight-2000-pinball-machine-by-williams