  We present our study of OGLE-2014-SN-073, one of the brightest Type II SN
ever discovered, with an unusually broad lightcurve combined with high ejecta
velocities. From our hydrodynamical modelling we infer a remarkable ejecta mass
of $60^{+42}_{-16}$~M$_\odot$, and a relatively high explosion energy of
$12.4^{+13.0}_{-5.9} \times10^{51}$~erg. We show that this object belongs, with
a very small number of other hydrogen-rich SNe, to an energy regime that is not
explained by standard core-collapse (CC) neutrino-driven explosions. We compare
the quantities inferred by the hydrodynamical modelling with the expectations
of various exploding scenarios, trying to explain the high energy and
luminosity released. We find some qualitative similarities with
pair-instabilities SNe, although a prompt injection of energy by a magnetar
seems also a viable alternative to explain such extreme event.
