Comparison of SN 2018ibb with the PISN models P250Ni25 and P250Ni34 from Kozyreva et al. (2017; left panel) and the He100, He125, and He130 from Heger & Woosley (2002; right panel). Templates with nickel masses of 34–44 M_⊙ are required to describe the entire bolometric light curve from t_max–93 to t_max+706 days. Models with M(Ni)=25 M_⊙ systematically underestimate the observed bolometric light curve, but they could still be viable if CSM interaction contributes significantly throughout the evolution.