A super-heavy tank is any tank that is notably beyond the standard of the class heavy tank in either size or weight relative to contemporary vehicles.
K-Wagen
…The Großkampfwagen or "K-Wagen" (short for G.K.-Wagen) was a German super-heavy tank, two prototypes of which were almost completed by the end of World War I. In June 1917, before the first A7V tanks had been completed, the German War…
British TOG II (80 tons) at The Tank Museum, Bovington
Model of the Flying Elephant design, projected to weigh 100 tons
German super-heavy tank Panzer VIII Maus (188 tons) at the Kubinka Tank Museum.